单项选择题

The first ______ of the bridge is one hundred meters long.

A．preface
B．span
C．block
D．phase
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单项选择题
John felt a little disappointed and was about to leave, ______ something occurred which attracted his attention.
A．while
B．when
C．until
D．unless
单项选择题
Mother always puts the knife beyond the reach of the kids lest they ______ it.
A．had taken
B．took
C．would take
D．should take
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