问题
选择题
---- Did you visit the Big Ben in London?
---- No, we ______ it, but we spent too much time shopping.
A．could visit
B．could have visited
C．must ahave visited it
D．can have visited
答案
答案：B
考查情态动词的用法。依据句意原本能够事实并非如此，用could have done 形式。