单项选择题

A．He was asked to leads group of inexperienced carets there.
B．It was the first cave that he had ever visited.
C．Clearly marked trails made it easy to explore.
D．lie hoped to make a discovery.
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填空题
Broadleaved plants in the temperate zones begin to shed their leaves before winter because they cannot______.
单项选择题
A．What the man’s plans are for tonight.B．Why the man does not want to play tennis.C．Why they do not have time to play tennis after class today.D．What time they can meet in the library.
A．What the man’s plans are for tonight.
B．Why the man does not want to play tennis.
C．Why they do not have time to play tennis after class today.
D．What time they can meet in the library.
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