单项选择题

Mary once （）with another musician to compose a piece of pop music.

A. merged
B. collaborated
C. coincided
D. constituted

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单项选择题
（37）（）

A. organizations
B. organisms
C. humans
D. children
单项选择题
A most （） argument about who should go and fetch the bread from the kitchen was going on when I came in.

A. trivial
B. delicate
C. minor
D. miniature
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