→ bramns:非假設句，是表事實，所以用現在式 02/26 00:32
→ bramns:如果選C，會造成前後時式不一致 02/26 00:33
Birds head south to warmer climate when _____
(A) is cold weather
(B) cold weather comes
(C) cold weather will come
(D) does cold weather come
(E) comes cold weather
The answer is (B) but I want to ask (C) why it can't choose .
是因為事情還沒發生,所以用假設句來表達嗎?
用現在式代替未來式 ,用過去式代替現在式之類的
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