单项选择题

______their work will give us a much better feel for the wide differences between the two schools of thought.

A．To have reviewed
B．Having reviewed
C．Reviewing
D．Being reviewed
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单项选择题
In order to prevent stress from being set up in the metal, expansion joints are fitted which ______the stress by allowing the pipe to expand or contract freely.
A．reclaim
B．reconcile
C．rectify
D．relieve
单项选择题
The 1986 Challenger space shuttle ______ was caused by unusually low temperatures immediacy before the launch.
A．dismay
B．disaster
C．expedition
D．controversy
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