Please be sure______Mr. Fargo’s documents by 2 p.m. because he needs them for a meeting.

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问题 Please be sure______Mr. Fargo’s documents by 2 p.m. because he needs them for a meeting.

选项 A、deliver
B、to deliver
C、to delivering
D、have delivered

答案B

解析 be sure to…是惯用句，意思是“一定要……”。这时应该在to之后接动词原形构成不定式短语。(B)和(C)都有to，但(C)项to后接的是动名词，所以并不适合。正确答案是(B)。

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