—Look! Someone ________ the floor.
—Well, it wasn't me. I went shopping just now.
A．had sweptB．has swept
C．was sweepingD．is sweeping
B
B 考察動詞時態(tài)。—看已經(jīng)有人掃過地了�！牛皇俏�。我剛剛出去買東西。根據(jù)it wasn’t me可以推斷掃地這一動作已經(jīng)完成，并結(jié)合語境分析，該動作的結(jié)果對現(xiàn)在的情況有影響，故用現(xiàn)在完成時。
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