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Can anyone tell me why "As" is the answer for this question?

I can understand easily that "4. So" is not correct.
"When" and "Since" are grammatically correct, aren't they?
I think As fits best, and When or Since sound a little weird.
But I do not understand clearly why they are not correct.


__________ technology improves, we are putting more and more personal
information into our computers.

1. As 2. When 3. Since 4. So

For learning: English
Base language: English
Category: Language

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    You are right, the answer is "has"

     

    "When" in this sentence would have the meaning of a kind of "rule" and would require the simple present:

    "When technology improves, we put more and more personal information into our computers."

    "Since" implies cause and effect, and would only work if the first part of the sentence was in the continuous form:

    "Since technology is improving, we are putting more and more personal information into our computers."
    (because A is happening, therefore B is also happening at the same time)

    "As" is correct because it shows two things happening at the same time. We use the simple present in the first part of the sentence because it shows something happening presently; we use the continuous form for the second part of the sentence to show what we are doing at the moment to respond to the improvements in technology. Similar examples are:

    As health care improves, people are living and working longer.
    As the climate changes, the polar ice caps are melting.

    "Since" means "from a time/event in the past until a later past time/event, or until now."
    She has been happy since she married Jack.
    "As" means "while something else is happening".
    As she grew older she gained in confidence.
    We use "as" only if two things happen at the same time.
    As we walked home, we talked about what we would have for dinner.
    We use when if one thing happens after another.
    When we got home, we started cooking the dinner.

     

    looks like straight copy and paste lol

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