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

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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
单项选择题
Because of a （） engagement, Lora couldn't attend my birthday party last Saturday.

A．pioneer
B．premature
C．prior
D．past
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