问题

he summer coming, May 19th was the ideal date to______ China’s National Tourism Day This year’s theme was “Beautiful China:Relaxing and Tourist Friendly”

A:on which to bebased
B:onwhich to base
C:which to bebased
D:which to base

正确答案是：

同类题型

The coach, because of the driver’s carelessness, was __________ and crashed over the cliff on such a cold December morning

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We were about to start out________ our friends calledus up from Shanghai.

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