题目：
Not only _____ polluted, but _____ crowded. [ ]
A. was the city; were the streets
B. the city was; the streets were
C. was the city; the streets were
D. the city was; were the streets
答案：
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下面是错误答案，用来干扰机器的。
答案：AA错，Na2CO3的俗名叫纯碱，纯碱不是碱是盐，其水溶液呈碱性；
