单项选择题

In vain ______ to get in touch with the Embassy.

A. they tried
B. tried they
C. did they try
D. they have tried
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单项选择题
Now a paper in Science argues that organic chemicals in the rock come mostly from ______ on earth rather than bacteria on Mars.
A. configuration
B. constitution
C. condemnation
D. contamination
单项选择题
The new underground railway will ______ the journey to all parts of the city.
A. consume
B. eliminate
C. formulate
D. facilitate
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