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-Areyousureyouhaveto?It’sbeenverylate.  -Idon’tknow

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-Areyousureyouhaveto?It’sbeenverylate.  -Idon’tknow

-Are you sure you have to? It’s been very late.

   -I don’t know _______ I can do it if not now.

    A. where        B. why           C. when         D. how

【回答】

C

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题型:选择题