单项选择题

It seems gas______from the pipe for some time. We'll have to call the gas company to put it right.

A. has been leaking
B. leaked
C. is leaking
D. had leaked
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单项选择题
I felt somewhat disappointed and was about to leave,______something occurred which attracted my attention.
A. unless
B. until
C. when
D. while
单项选择题
As a newly retired chairman, he is not used______to like that.
A. to being spoken
B. to speak
C. being spoken
D. to speaking
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