问题补充:
----- Will they send their homework the teacher e-mail ?
--- -Yes , they will.
A. to , by.
Bat,with.
C. for ,by
D. by , to
答案:
(答案→)A. to , by.
B. at,with.
C. for ,by
D. by , to
解析:to到,向;by通过,到……为止;with伴随,用;at在时间空间的一点。句意:他们通过电子邮件把作业发送给老师吗?——是的,他们会的。结合语境可知前一空用介词to表示发送的对象,后一空用by表示方式,故选A。