单选题：The reason_______the president kept silent is still unknown．

题目内容：

The reason_______the president kept silent is still unknown． A．why
B．how
C．what
D．when

参考答案：

答案解析：

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Mary picked up her children' s clothes that_______on the floor．A．lie B．will lie

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What do we know about a condo hotel?A．It is designed by rich companies． B．It is

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