Last Monday I was asked to give the new students a test their English level.A. gradingB.

问题补充：

Last Monday, I was asked to give the new students a test their English level.

A. grading

B. to grade

C. to have graded

D. having graded

答案：

A. grading

(答案→)B. to grade

C. to have graded

D. having graded

解析：考查非谓语动词。句意：上周一，我被要求给新学生们一次测试，来给他们的英语水平划分等级。根据句意可知，这里表示目的，且表将来，应该用动词不定式，排除A、C、D；故选B。