单项选择题

They always give the vacant seats to （） comes first.

A．whoever
B．whomever
C．who
D．whom

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单项选择题

Owing to （） competition among the airlines, travel expenses have been reduced considerably.

A．fierce
B．strained
C．eager
D．critical

单项选择题

John doesn't believe in （） medicine; he has some remedies of his own.

A．standard
B．regular
C．routine
D．conventional

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