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
（） that our knocking could not wake him up.

A、So deeply he slept
B、So deeply did he sleep
C、Did he sleep so deeply
D、Deeply he slept
单项选择题
The production of too many useful things results （） too many useless people.

A、 from
B、 out
C、 up
D、 in
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