单项选择题

She () for a while and was unable to make a decision, so she asked for my help.

A. flickered
B. glittered
C. faltered
D. blinked

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单项选择题
In recent years there has been a () increase in the cost of living; many families have to depend on the federal aids.

A. ponderous
B. powerful

C. significant
D. violent
单项选择题
The students take a () test in March, and the main exam is in July.

A. previous
B. preliminary
C. preceded
D. elementary
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