单项选择题

Little John caught a bad cold because he()in the snow all afternoon.

A. had been playing
B. is playing
C. had laid
D. lay

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There's () milk in the bottle.

A. few
B. a number of
C. plenty of
D. any
单项选择题
Everyone is busy working. You can't stay here () you keep quiet.

A. when
B. once
C. if
D. unless
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