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【单选题】
— I didn't hear you come in last night. — That's good. We tried ______ noisy. [ ]A.
not be
B.
not to be
C.
to be
D.
to be not
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【单选题】The sharp rise of the snow geese population is mainly caused by______.
A.
lack of natural enemies
B.
great care of wildlife preservationists
C.
favorable conditions in their winter habitat
D.
changes in their migration patterns
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