单项选择题

Landslides triggered by heavy rainfall impeded our best attempts at rescuing the victims.

A．encouraged
B．hindered
C．nullified
D．crowned
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When he formed his own company in 1949, Minoru Yamasaki had had years of experience with New York's top architectural firms.
A．tallest
B．chief
C．except
D．like
单项选择题
The boy was not ______ to leave class without an adequate reason.
A．emitted
B．admitted
C．permitted
D．remitted
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