The house is dark; the Browns ______ to bed.

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问题 The house is dark; the Browns ______ to bed.

选项 A、may go
B、should go
C、should have gone
D、must have gone

答案D

解析 本题测试情态动词的用法。“must do”表示对现在的肯定判断,“must have done”表示对过去的肯定判断。句子的意思是:“房子是黑的,布朗一家肯定已经睡了。”
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