选择题："The key to__________the medical problems is health care reform," said the minis

题目内容：

"The key to__________the medical problems is health care reform," said the minister.

A.solve

B.solving

C.being solved

D.be solved

参考答案：

答案解析：

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In Canada, citizens,_________their backgrounds, are free to keep and promote their cultural heritage

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