The teacher and writer as well as some students something when we entered the room.
| A．discussed | B．were discussing | C．have discussed | D．was discussing |
答案 :
D
—Can you tell me if Tom has finished his homework?
—I"ve no idea. He ________ it this morning.
| A．has being doing | B．had done |
| C．is doing | D．was doing |
答案 :
D
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