I’ll be back 5 o’clock tomorrow afternoon. A. about B. around C. until D. for

I’ll be back _____ 5 o’clock tomorrow afternoon.

　 A. about 　 B. around

　 C. until 　 D. for

试题答案

B

about是副词，表示具体的时点要加介词at；around是介词，大约的意思。