问题
It is reported that in our country cities ________heavy air pollution that is 30 percent above the national standard or highershould try to meet standards by 2030.
A:suffering
B:suffer
C:suffered
D:are suffering
B:suffer
C:suffered
D:are suffering
正确答案是：
同类题型
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Sue didn’t come to school yesterday， did she—-_________.Though she was terribly ill.