单项选择题

It was (when) she was (about) (to go) to bed (while) the telephone rang.

A．when
B．about
C．to go
D．while
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单项选择题
He's perfectly (content) (living) in a hut and (paint) pictures (all day).
A．content
B．living
C．paint
D．all day
单项选择题
(Rarely) (we have seen) such an effective actor (as he) has proven himself (to be).
A．Rarely
B．we have seen
C．as he
D．to be
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