单项选择题

______ explain it to him, he still didn't understand.

A．Hard as I tried to
B．As I tried hard to
C．Hard I tried to
D．Tried as I hard to
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We could do nothing but ______ till he came back.
A．to wait
B．waiting
C．wait
D．waited
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The girl appeared ______ with the small world her parents had constructed for her.
A．sensitive
B．satisfactory
C．content
D．curious
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