问题
The number of historic buildings which ________ has reached a surprising figure that we must be aware of
A:has been pulled down
B:had been pulled down
C:is being pulled down
D:have been pulled down
B:had been pulled down
C:is being pulled down
D:have been pulled down
正确答案是：
同类题型
your business becomes international,_____ constantly will be part of your life
When the book, Twilight, was first _____, it was immediately well received by readers. [ ]
Difficultiesandhardshipshave________thebestcharacteroftheyounggeologist
She stepped into the bedroom quietly _____she might wake up her roommates