单项选择题

Most engineers were ______ about the effectiveness of the new model of word-processors.

A．pessimistic
B．doubtful
C．worry
D．ignorant
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单项选择题
The unpopular measure finally ______ the downfall of the government.
A．brought about
B．brought back
C．brought down
D．brought in
单项选择题
The owner wouldn't ______ to our making any structural change in the flat.
A．consent
B．contend
C．contest
D．contact
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