单项选择题

A．he thought Mr. Sun has written the letter well
B．there is something wrong about the grammer
C．they can be improved according to western culture
D．these are not polite ways of expression
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单项选择题
Which president did nothing with the root of Vietnam War
A．Truman.
B．Kennedy.
C．Eisen Hower.
D．Nixon.
单项选择题
Which of the following sounds is a voiced affricate
A．[j].
B．[tf].
C．[z].
D．[d3].
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