单项选择题

These problems have______ as the result of the lack of mutual communication.

A．arisen
B．risen
C．roused
D．aroused
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单项选择题
It has been rather costly to install the machinery, but it will prove to be worth the money______.
A．in the long run
B．at long last
C．in conclusion
D．a the end
单项选择题
A business letter should be written in a formal style______ in a personal tone.
A．better than
B．other than
C．rather than
D．less than
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