英语that指代问题
1.The problem of pollution in this city is more serious than ___ in other cities.
A.thatB.itC.this D.those
2.It is much more sandy in Beijing than ___ in spring and early summer.
A.in Tianjin B.that in Tianjin C.Tianjin D.it in Tianjin
答案都是A,为什么第二题不能选B