– Why does she look so tired?
-- She ________ all the morning and she still hasn’t finished it.
A．cleanedB．was cleaningC．has been cleaningD．has cleaned
C
clean這個動作，之前就發(fā)生了，一直到現(xiàn)在還沒完成，還在繼續(xù)，因此用現(xiàn)在完成進行時態(tài)。
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