单选题
The nation as a whole cannot become rich ______ the peasants are relatively well off.
A、
if
B、
before
C、
though
D、
unless
【正确答案】
D
【答案解析】
[解析] if:如果,即使;before:在……之前;though:虽然;unless:除非,如果不。故选D。
提交答案
关闭