单项选择题

The detective and his assistant have begun to _______ the mysterious murder.

A．come through
B．look into
C．make over
D．see to
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单项选择题
Very few people could understand the lecture the professor delivered because its subject was very _______.
A．obscure
B．indefinite
C．dubious
D．intriguing
单项选择题
The engine _______ smoke and steam.
A．gives up
B．gives in
C．gives away
D．gives off
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