单项选择题

They stayed up late trying to ______out a way to solve the problem.

A．let
B．give
C．knock
D．figure
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单项选择题
Smith did the only ______thing by asking the Indians for food and shelter in their village.
A．sensitive
B．sentimental
C．sensible
D．sensational
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 no rain
C．There having been no rain
D．There being no rain
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