问题

Do you know the tower _____ in the heart of thecity — You mean the one _____ from the MingDynasty
A:am able; couldn’t
B:could; was able to
C:was quite able to; couldn’t
D:couldn’t was able to
B:could; was able to
C:was quite able to; couldn’t
D:couldn’t was able to
正确答案是: