单项选择题

The police __ the records of all those involved in the crime.

A．looking into
B． being looked into
C．is looking into
D．are looking into
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单项选择题
The word's supplies of petroleum __
A．are gradually exhausted
B． are being gradually exhausted
C．have been gradually being exhausted
D．have gradually exhausted
单项选择题
My husband's arm got hurt __ the iron tower
A．while we were climbing up
B．while he is climbing up
C．while he climbed up
D． while we climbed up
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