—Whataretheydoing?—Ithinkthey________theirhomeworkatthemoment.A.weredoi

发布时间：2020-08-04 15:38:25

—What are they doing?—I think they ________ their homework at the moment.A.were doingB.may have doneC.could be doingD.must do

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C解析根据问话得知答语是推测，They could be doing their homework at the moment 表示的是可能性不大的推测。其余三个
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