We have no time to lose. Let’s ______ on the task before us.

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问题 We have no time to lose. Let’s ______ on the task before us.

选项 A、enter
B、impose
C、concentrate
D、overwork

答案C

解析 enter进入;impose强加;concentrate集中;overwork过劳。该组选项中只有impose和concentrate能与on搭配,但impose不合句意。
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