Joan didn’t go to the party last night because she ______the baby for her sister until 9: 30.

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问题 Joan didn’t go to the party last night because she ______the baby for her sister until 9: 30.

选项 A、must have looked after
B、would have to looked after
C、had to look after
D、should have looked after

答案C

解析 本题考查句子时态。题干包含由because引导的原因状语从句,主句表示结果,从句表示原因,主从句时态应前后照应,所以用一般过去时,故答案为[C]项。
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