单项选择题

The authorities spend a lot of money ______ keeping the streets and parks clean.

A. in
B. on
C. up
D. out
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单项选择题
On the end of his nose was a ______ of thick glasses.
A. pair
B. set
C. couple
D. suit
单项选择题
That contract, about ______ we had a disagreement last month, had now gone through.
A. whom
B. which
C. what
D. that
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