单项选择题

__ is not clear.

A．That he will come
B．He will come
C．Whether he will come
D．If he will come
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单项选择题
Cooperation should __ for mutual benefit in energy development and utilization.
A．be enhanced
B．enhance
C．have enhanced
D．to be enhanced
单项选择题
Devotion means __ our heart on one thing at a time and give up all other thoughts.
A． setting
B．set
C．to set
D．that setting
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