单项选择题

I regret ______ so much time and money on stamps.

A．to waste
B．for wasting
C．having wasted
D．at wasting
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单项选择题
He was ______ very attentively, with eyes half-closed.
A．hearing
B．listening
C．looking
D．thinking
单项选择题
He was amazed at ______ he saw.
A．that
B．what
C．which
D．whom
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