问题

Ther will be less pollution ___more people use public transportation .
A:but
B:though
C:unless
D:if;
B:though
C:unless
D:if;
正确答案是:
同类题型
________ has already been pointed out, only by correcting mistakes can you make progress
─When do you get up Sunday morning─I usually get up 8 in the morning.
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