单项选择题
I’’m putting on weight. The doctor has warned me to_________ sugar.
A.keep up
B.keep back
C.keep off
D.keep away
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单项选择题
By the time you arrive this evening,_________ for two hours.
A.I will study
B.I will have been studied
C.I had studied
D.I will have been studying
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单项选择题
_____you’’ re early you can’’t be sure of getting a seat.
A.If
B.Unless
C.When
D.Because
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