单项选择题

Never has a scientific explanation emerged（）someone somewhere has objected to it.

A. that
B. which
C. whom
D. but

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单项选择题
He spends his time in（）complaints rather than acting

A．fragile
B．fertile
C．frangible
D．futile
单项选择题
Experience leads me to think that it is not always good to get （）with strangers.

A. tolerant
B. confidential
C. enthusiastic
D. agreeable
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