单项选择题


A．enlarged
B．enhanced
C．extended
D．strengthened
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单项选择题
A．IfB．BecauseC．AlthoughD．While
A．If
B．Because
C．Although
D．While
单项选择题
A．howeverB．indeedC．thoughD．therefore
A．however
B．indeed
C．though
D．therefore
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