单项选择题

The writer was so ______ in his writing that he forgot to flick the ashes from his cigar.

A．fixed
B．concentrated
C．absorbed
D．focused
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单项选择题
The survivors from the shipwreck______together under the rock to keep warm.
A．quavered
B．grappled
C．stumbled
D．huddled
单项选择题
I forgot ______ her that my coat buttons need to be sewn on.
A．reminding
B．having reminded
C．to remind
D．to have reminded
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