The mother insisted her child .
A. to be checked
B. on having a check
C. be checked
D. should check
网友回答
A. to be checked
B. on having a check
(答案→)C. be checked
D. should check
解析：考查虚拟语气。当insist表示坚持要求的时候，后面使用(should)+动词原形。句意：妈妈坚持要求儿子被检查。C项中省略了should.