They have devoted all their time _______ the sick. [ ]A. to help B. to have helped C. to helping D. helping -初中英语-n多题

◎ 题干

They have devoted all their time _______ the sick.

[ ]

A. to help
B. to have helped
C. to helping
D. helping

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◎ 解析

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◎ 知识点

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