2. 外语
  3. You ______ the experiment twice, not once.

You ______ the experiment twice, not once.

admin2009-02-13  43
问题 You ______ the experiment twice, not once.
选项 A、should have carried out
B、shouldn’t have carried out
C、haven’t carried out
D、couldn’t have carried out
答案A
解析 “should+不定式完成式”表示“本应该做而实际没有做”的虚拟语气含义。
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