单项选择题

They went on working （）it was late at night.

A. even if
B. as if
C. however
D. as though

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单项选择题

On the table （）two dictionaries, one open, the other closed.

A. lies
B. lays
C. laid
D. lie

单项选择题

（）she is living now is not known to anybody.

A. Whether
B. When
C. Where
D. Why

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