单项选择题

A．forbids
B．discourages
C．prevents
D．allows
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单项选择题
A．only beforeB．unlessC．althoughD．only if
A．only before
B．unless
C．although
D．only if
单项选择题
A．in undergroundB．below undergroundC．undergroundD．undergroundly
A．in underground
B．below underground
C．underground
D．undergroundly
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