—Why are those people gathering in the middle of the street?—I don’t know. There be an ac

问题补充：

—Why are those people gathering in the middle of the street?

—I don’t know. There be an accident.

A. shall

B. should

C. can

D. might

答案：

A. shall

B. should

C. can

(答案→)D. might

解析：本题考查情态动词。句意：--街道中间为何聚集了这么多人？--我不知道，也许发生了交通事故。might也许；可能。表示不肯定的猜测。