摘要： He doesn’t know . A. how to do B. to do how C. do how D. how to do it
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He looks upset. He doesn’t know ________.
A. what to do it B. how to do it C. how to do D. do what
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He looks upset. He doesn’t know ________.
A. what to do it B. how to do it C. how to do D. do what
查看习题详情和答案>>