填空题

1（）

【参考答案】

Three
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单项选择题
How many missing American servicemen have been positively confirmed dead in Vietnam so far（）

A．67.
B．280.
C．84.
D．1648.
单项选择题
The interviewee is not self-employed mainly because（）

A．her husband likes her to work for a firm.
B．she prefers working for the government.
C．self-employed work is very demanding.
D．self-employed work is sometimes insecure.
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