单项选择题

Roses need special care ______ they can live through winter.

A．because
B．so that
C．even if
D．as
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单项选择题
Prices of food in that area ______ sharply since word came that the war would break out soon.
A．were cut down
B．were rising
C．have been brought down
D．have been going up
单项选择题
Professor Li, who I ______ abroad, still teaches in Peking University.
A．think went
B．think to have gone
C．thought went
D．thought had gone
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