Question

【题目】—The air is full of smoke and people are coughing.

—It will get worse________the government does something about the pollution.

A．but

B．unless

C．except

D．if

Answer 1

【答案】B

【解析】考查条件状语从句。unless相当于if...not，引导条件状语从句。but为转折连词；except“除了”；if引导条件状语从句，与题意不符。