[单选题]题目15未回答满分1.00未标记标记题目. The secretary worked late into the night, ______ along speech for the president.
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2024-02-03 16:07:02
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[单选题]题目15未回答满分1.00未标记标记题目. The secretary worked late into the night, ______ along speech for the president.

a. to prepare
b. was preparing
c. prepared
d. preparing
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