单项选择题

Nobody______ when I complained about the food, so nothing was done about it.

A. turned to me
B. relied on me
C. backed me up
D. held me up
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单项选择题
Climate change was probably important in both ______ and evolution of dolphins.
A. execution
B. extinction
C. exclusion
D. excavation
单项选择题
If a substance is dissolved in water or heated, it may ______ a gas.
A. give away
B. give in
C. give off
D. give back
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