问题

The Yellow River______ flood large areas, but now the waters of it are used to_ energy.

A:was used to; producing
B:used to; producing
C:was used to; produce
D:used to; produce;

正确答案是：

同类题型

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ing to the law, all foreigners have to ________with the local police within two weeks of arrival.

If I hadn’t stood under the ladder to catch you when you fell, you _____ now.

Andrew was afraid to fill the room with water again, so he __________ the pipe carefully.