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
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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
单项选择题
By the time you arrive in London, we ______ in Europe for two weeks.
A．shall stay
B．have stayed
C．will have stayed
D．have been stayin
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