单项选择题
16（）
A．copies
B．collects
C．reads
D． knows
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单项选择题
Please give me more time;______ I shall not be able to finish the paper by next Monday.
A．meanwhile
B．therefore
C．otherwise
D．still
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单项选择题
John and Sue______ computer games for hours before their parents came home from work.
A．are playing
B．have been playing
C．played
D．had been playing
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