The secretary worked late into the night, ______ a long speech for the president.

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问题 The secretary worked late into the night, ______ a long speech for the president.

选项 A、to prepare
B、preparing
C、prepared
D、was preparing

答案B

解析 此句考查非谓语动词的用法。此处没有连词,且用逗号隔开,只能用分词短语作状语。
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