单项选择题

（）to use crutches for six months severely limited Mr. Locke's ability to work in the shipping facility.

A. Has
B. Have
C. Having
D. Has had

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单项选择题
The policeman asked the boy （）

A. where is his mother
B. where his mother is
C. where was his mother
D. where his mother was
单项选择题
The secretary tried to （） the smoke by opening a window of the meeting room.

A. deface
B. detect
C. discriminate
D. dissipate
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