Module 12 Help
模块自测
一、单项填空(10分)
(C)1.—What’s behind ________ door? I can’t open it.
—Let me see. Oh, there is a ball.
A. a B. an
C. the D. /
(A)2.—Must we clean the classroom right now?
—No, you needn’t, but you ________ do it today.
A. must B. mustn’t
C. may D. needn’t
