单项选择题

A．It’s only open to poetry majors.
B．It requires another class first.
C．It’s already full.
D．It’s only offered in the morning.
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单项选择题
A．He was too busy.B．He was sick.C．He lacks confidence.D．He was at a meeting.
A．He was too busy.
B．He was sick.
C．He lacks confidence.
D．He was at a meeting.
填空题
Natural gas trapped in underground reservoirs is extracted by _______.
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