．— Has Tom finished his report so far?
— I have no idea．He ______it this morning．
A．didB．has doneC．was doingD．had done
C
考查時態(tài)，句意：--湯姆到現(xiàn)在完成報(bào)告了嗎？--我不知道，他今天早上正在寫。過去進(jìn)行時表示過去正在做的動作，但不一定完成，和句意相符，選C。
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