单项选择题

Prof. Lee's book will show you ______ can be used in other contexts.

A．that you have observed
B．that how you have observed
C．how that you have observed
D．how what you have observed
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单项选择题
Scientists generally agree that the Earth's climate will warm up over the next 50 to 100 years ______it has warmed in the 20,000 years since the Ice Age.
A．as long as
B．as much as
C．as soon as
D．as well as
单项选择题
From the tears in Nedra's eyes we can deduce that something sad ______.
A．must have occurred
B．would have occurred
C．might be occurring
D．should occur
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