单项选择题

Many great scientists ______ their success to hard work.

A．portray
B．ascribe
C．impart
D．acknowledge
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单项选择题
Some crops are relatively high yielders and could be planted in preference to others to ______ the food supply.
A．enhance
B．curb
C．disrupt
D．heighten
单项选择题
A thief who broke into a church was caught because traces of wax, found on his clothes,______ from the sort of candles used only in churches.
A．had come
B．coming
C．come
D．that come
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