单项选择题

John is collaborating with Mary in writing an article.

A.cooperating
B.competing
C.combining
D.arguing
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单项选择题
The river widens considerably as it begins to turn west.
A.twists
B.stretches
C.broadens
D.bends
单项选择题
These programmes are of immense value to old people.
A.natural
B.fatal
C.tiny
D.enormous
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