单项选择题

Since I began to work here three years ago, this factory ______ in size.

A． had doubled
B． has doubled
C． doubled
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单项选择题
—Is this Tom's dictionary—No, it's ______.
A． mine
B． my
C． me
单项选择题
______ the key this way to open the door.
A． Take
B． Move
C． Turn
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