单项选择题

When the engine would not start, the mechanic inspected all the parts to find what was at ____________.

A． wrong
B． trouble
C． fault
D． difficulty
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单项选择题
John complained to the bookseller that there were several pages _____________in the dictionary.
A． missing
B． losing
C． dropping
D． leaking
单项选择题
We are not (conscious of) the extent (of which) work provides the psychological satisfaction (that) can make (the difference) between a full and an empty life.
A．conscious of
B．of which
C．that
D．difference
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