Mother insisted that______.

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问题 Mother insisted that______.

选项 A、they are to be back before nine in the evening
B、they ought to be back before nine in the evening
C、they be back before nine in the evening
D、they had to be back before nine in the evening

答案C

解析 insist表示“坚决要求”。其后的宾语从句中要用虚拟语气,其构成是should do,should可以省略。
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