单项选择题

I felt somewhat disappointed and was about to leave ______ something occurred which attracted my attention.

A．unless
B．when
C．until
D．while
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单项选择题
I don't remember the name of the English teacher, ______ course I took last semester.
A．which
B．that
C．the
D．whose
单项选择题
Tourists often surprised at ______ so many flat and good roads in the mountainous regions.
A．there are
B．there to be
C．there being
D．there were
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