2. 职称英语
  3. It______about seven o’clock when Tom returned home for it was already dark outsi

It______about seven o’clock when Tom returned home for it was already dark outsi

游客2023-09-21  50
问题 It______about seven o’clock when Tom returned home for it was already dark outside.
选项 A、must be
B、must have been
C、was to be
D、had to be
答案 B
解析 must在表示对现在的状态或现在正在发生的事情进行推测时，后面通常接系动词be；表示对已经发生的事情进行推测时，runst后面要接完成式。本题中，由原因状语从句it was already dark outside可推知，事情发生在过去的时间，因此谓语需要使用“must+完成式"的结构，故确定本题的答案为B)。
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