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

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

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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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