单项选择题

Thirteen hundred medical professionals, all of which have been trained to treat drug dependency, attended the annual convention sponsored by a society()

A.Thirteen hundred
B.all of which
C.attended
D.sponsored

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单项选择题
When he speaks at banquets, he makes a point of going into the kitchen and to shake hands with every waiter and waitress.()

A.at
B.makes
C.to shake
D.hands
单项选择题
Although the police are given considerable authority by society to enforce its laws, they get a relatively low salary as compared with that of other occupational groups which have much fewer authority.().

A.are
B.its
C.that
D.fewer
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