单项选择题

It's very （） of you not to talk aloud while the baby is asleep.

A．concerned
B．careful
C．considerable
D．considerate

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单项选择题
Not having a good command of English can be a serious （） preventing you from achieving your goals.

A．obstacle
B．fault
C．offense
D．distress
单项选择题
The continuous rain （） the harvesting of the wheat crop by two weeks.

A．set back
B．set off
C．set out
D．set aside
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