" Why didn ’ t your wife answer my phone last night?" "I think she______when you called. "

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问题 " Why didn ’ t your wife answer my phone last night?" "I think she______when you called. "

选项 A、had to have slept
B、has to be sleeping
C、must sleep
D、must have slept

答案D

解析 情态动词题。句意:“昨天晚上你妻子为什么不接我电话?”“我想你打电话时她一定睡着了。”从答语中可以看出是一种肯定的推测,并且打电话的那个时候妻子已经睡着了。must have done表示对过去动作的肯定推测。
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