单项选择题

Children are always happy. They can play ______.

A. for their heart's content
B. for their heart content
C. to their heart's content
D. to their hearts' content
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单项选择题
Advertising is different from other forms of communication ______ the advertisers pay for the message to be delivered.
A. in order that
B. where
C. in that
D. in the way
单项选择题
Little______that the girl has fallen in love with him．
A．he knows
B．he doesn't know
C．does he know
D．doesn't he know
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