单项选择题
There is not much time left for you to cover everything, you'd better ______ unimportant points. ( )
A.leave off
B.focus on
C.leave out
D.concentrate on
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单项选择题
To my great surprise the food was still on the table, ______. ( )
A.not to be touched
B.untouched
C.untouching
D.no touch
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单项选择题
If ______, he promises that he will spare no effort in promoting public welfare. ( )
A.elected
B.elect
C.electing
D.being elected
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