单项选择题

The investigators ______ for lunch.

A．process
B．excess
C．recess
D．access
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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
_______conscious of my moral obligations as a citizen.
A．I was and always will be
B．I have to be and always will be
C．I had been and always will be
D．I have been and always will be
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