单项选择题

We should do everything in our power to develop()alternatives to petrol.

A. audible
B. capable
C. liable
D. viable

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单项选择题
A soldier has to learn to carry ()orders as soon as they are given.

A. on
B. out
C. through
D. off
单项选择题
The market sells mainly fruit, vegetables and dairy().

A. produce
B. production
C. output
D. stocks
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