The lights were still on. They______ (forget) to turn them off when they left th

游客2023-09-26 30

问题 The lights were still on. They______ (forget) to turn them off when they left the classroom.

选项

答案 must have forgotten

解析句意：灯仍亮着。他们肯定是在走的时候忘了关。注意must have forgotten 实际上是一种极其肯定的判断形式，即情态动问must后跟have done 这种结构表判断。

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