单项选择题

If you keep on, you'll succeed ().

A.in time
B.at one time
C.at the same time
D.on time

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单项选择题

We must get up early tomorrow, ()we'll miss the first bus to the Great Wall.

A.so
B.or
C.but
D.however

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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