单项选择题

______ for quite a long time, the rivers here are all dried up.

A．There has been no rain
B．Having ,lo rain
C．There having been no rain
D．There being no rain
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单项选择题
The energy ______ by the chain reaction is transformed into heat.
A．entrusted
B．released
C．delivered
D．conveyed
单项选择题
A．searchingB．scoutingC．plunderingD．stretching
A．searching
B．scouting
C．plundering
D．stretching
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