单项选择题

A holiday in Holland is unlikely to cost very much ______ you stay in the top class luxury hotel.

A．when
B．unless
C．if
D．since
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单项选择题
No one could tell us anything about the ______ stranger.
A．conscious
B．mysterious
C．serious
D．previous
单项选择题
She was upset because of her watch, ______ she had been given as a 21st birthday gift, was lost.
A．which
B．as
C．what
D．that
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