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
B:onwhich to base
C:which to bebased
D:which to base
正确答案是：
同类题型
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