单项选择题

Tom is bankrupt now. He is desperate because all his efforts （）failure.

A．tumbled to
B．hinged upon
C．inflicted on
D．culminated in

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单项选择题
Professor Smith explained the movement of light （）that of water.

A．by analogy with
B．by virtue of
C．in line with
D．in terms of
单项选择题
Very few people could understand his lecture because the subject was very （）

A．faint
B．obscure
C．gloomy
D．indefinite
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