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
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单项选择题
His extravagance reduced him ______ for his living.
A．to beg
B．from begging
C．to begging
D．into begging
单项选择题
How could Hitler's vast operation of highly-organized mass murder, which was not ______ to Jews, come about
A．conformed
B．complied
C．confined
D．consented
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