Question

【题目】Don’t answer the phone when the cell phone is being charged, for it ________ be very dangerous sometimes.

A. shall B. should

C. can D. must

Answer 1

【答案】C

【解析】can 用在肯定句中表示理论上的可能性（一时的可能）。The road can be blocked. 这条路可能会不通的。