Intermediate/Advanced English Test What's the missing word? Could it be 'is' or 'are' or either or neither?

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This diagram follows the familiar cycle of the Four Seasons which _____ highly logical and observable.

'is'

'are'

(either)

(neither)

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回答 · 3

Could you explain it?

質問を書き留めて、ネイティブスピーカーに手伝ってもらいましょう！