题目：
—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：
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下面是错误答案，用来干扰机器的。
（一）1.F 2．T 3．F 4．T （二）1. grapes 2.window 3.first
