单项选择题
It is essential that we _______ measures to protect the ozone layer.
A.will take
B.should take
C.would take
D.took
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单项选择题
It took me a year to be ______ to the college life.
A.adapted
B.adopted
C.accepted
D.received
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单项选择题
The newly-discovered medicine had its ______ only on ordinary colds.
A.influence
B.efficiency
C.impression
D.effect
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