问题
The secretary worked late into the night, ___________ a long speech for the international conference. [ ]
A: to prepare
B: prepared
C: preparing
D: was preparing
B: prepared
C: preparing
D: was preparing
正确答案是：
同类题型
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May I take this book out of the reading room?—No，you ________.You read it in here.
We have worked out a plan. But I’m not sure whether it will do in .