Our teachers often ask us over the answers carefully before handing in our papers.
A. go
B. going
C. to go
D. gone
网友回答
A. go
B. going
(答案→)C. to go
D. gone
解析：考察动词固定搭配。固定搭配ask sb to do sth要求某人做某事；句意：我们的老师经常要求我们在交卷之前认真检查答案。句中的不定式to go over the answers在句中作宾语补足语。故C正确。