The students will stay home and send their homework to the teacher email . A. at byB.

问题补充：

The students will stay home and send their homework to the teacher email .

A. at , by

B. at , at

C. by, by

D. by , at

答案：

(答案→)A. at , by

B. at , at

C. by, by

D. by , at

解析：by通过……表示方式，只有选项a符合句意。