单选题
The children ______ before they work in the Restaurant.
A、
A. must be trained
B、
B. must be over seven years old
C、
C. should know how to read and write
【正确答案】
A
【答案解析】
[解析]由本文第一段第四行“After training，they may work in the Restaurant for four weeks．”可知，故本题答案为A。
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