单项选择题

_____ his work, he would do it till it was finished.

A) Once Charles would start
B) Once Charles started
C) Since Charles would start
D) Since Charles started
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单项选择题
It is urgent that a new president _____ for the university.
A) is elected
B) elected
C) will be elected
D) be elected
单项选择题
It is reported that crimes are most likely to happen in cities _____ a large percentage of unemployment.
A) which they have
B) that having
C) that have
D) where have
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