2. 专升本
  3. He______his homework yesterday, so he couldn’ t join us in outing.

He______his homework yesterday, so he couldn’ t join us in outing.

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问题 He______his homework yesterday, so he couldn’ t join us in outing.
选项 A、had to do
B、must have done
C、ought to have done
D、must do
答案B
解析
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