—I’m worried about the coming test. —You should work hard for it you’ll have to take it a

问题补充：

—I’m worried about the coming test.

—You should work hard for it,you’ll have to take it again.

A. and

B. or

C. but

D. however

答案：

A. and

(答案→)B. or

C. but

D. however

解析：句意：----我担心即将到来的考试，---你应该为考试努力学习，要不然你还得再考一次。A.and 表示并列关系 B.or 表示否则要不然， C.but 但是，表示转折 D.however然而，表示转折

结合语境可知选B。