单项选择题

During the one-month trial period, customers are under no ______ to sign any contracts.

A. pledge
B. promise
C. obligation
D. engagement
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单项选择题
The music faculty offers free weekly seminars designed to encourage young musicians to begin ______ their own masterpieces.
A. composer
B. composes
C. composed
D. composing
单项选择题
150（）

A. job
B. chance
C. limit
D. pursuit
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