单项选择题

Three fifths of the police （）in the school near the town.

A.has trained
B.have trained
C.has been trained
D.have been trained

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He served in the army for only （）before he was sent back.

A.one and a half year
B.one year and a half
C.a year and a half
D.a year and half
单项选择题
My brother got his first job at （）age of 20。

A.an
B.the
C./
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