'I usually sleep with the windows closed at night, even in summer.''You can never be ______ careful.'
A.very
B.much
C.too
D.so

A.''You
B.'
A.very
B.much
C.too

【参考答案】

C
解析：考查副词的用法。You can never be too careful是固定表达，意为“你再怎么小心......

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