—Excuse me. Is this the right way to the Summer Palace? —Sorry I am not sure but it be.

问题补充：

—Excuse me. Is this the right way to the Summer Palace?

—Sorry, I am not sure, but it be.

A. must

B. can

C. might

D. will

答案：

A. must

B. can

(答案→)C. might

D. will

解析：考查情态动词：might 和can都是表示推测，但是might的可能性最小，前面一句说I am not sure，表示他也不大确信，所以这里用might，