单项选择题

Sales went down （） difficult trading conditions.

A.because
B.thanks to
C.since
D.due to

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单项选择题

If there were fewer management staff, more work （）.

A.would be done
B.will be done
C.would have be done
D.should be done

单项选择题

Having been familiar with his ability, （）.

A.the manager was assigned a challenging task
B.the manager assign a challenging task
C.the board assigned him a challenging task
D.a challenging task was assigned to the manager