单项选择题

The reason ______ he did not arrive in America as scheduled was that his flight was called off because of the bad weather.

A．when
B．why
C．which
D．where
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单项选择题
The book is ______ more difficult than the one I read last week.
A．rather
B．very
C．much
D．more
单项选择题
We congratulated him on ______ chairman.
A．his elected
B．his electing
C．his being elected
D．his elected
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