单项选择题

We are taught that a business letter should be written in a formal style ________________ in a personal one.

A．rather than
B．other than
C． better than
D． less than
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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
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
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