题目

The boss can't come to work today, because he       Guangzhou.    A. has gone to    B. has been to       C. has been in     D. goes to 答案：A在研究光对鼠妇生活的影响实验中所用鼠妇数量是（ ）A．一只 B．两只 C．三只 D．十只以上