问题
选择题
The secretary worked late into the night, ___________ a long speech for the international conference.
[ ]
A. to prepare
B. prepared
C. preparing
D. was preparing
答案
答案：C
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The secretary worked late into the night, ___________ a long speech for the international conference.
[ ]
A. to prepare
B. prepared
C. preparing
D. was preparing
答案：C