Some grammar tests
I have filled out some grammar tests recently. I have checked the correct answers and there are several that i don't understand why are these the correct ones. So I am confused a little. By the way,if you can find any mistakes in these sentences feel free correct me. Thanks.
23. I'm awfully sorry, but I ... the password just now.
A/ don't remember x
B/ couldn't remembered
C/ am not remembering
D/ can't remember back
The key answer sheet says 'A' is the right answer. Why?
I have chosen the C. Why is C wrong?
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25. I wanted to buy a Sony camcorder, but the the last one ... yesterday.
A/ has sold
B/ was sold
C/ was selling
D/ sold x
The key answer sheet says 'D' is the right answer. Why?
I would choose the B . ...the last one "was sold " yesterday. Is it wrong?
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Thank for your help very much in advance.