—whataboutyourhistorytest?—Ihaveansweredallthequestions,butI'mnot

发布时间：2020-08-04 15:45:40

— what about your history test?— I have answered all the questions,but I'm not sure ________ I have got them all right．A.whatB.howC.thatD.why

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C解析that引导从句作be,sure的宾语
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