问题补充:
Look! Many people the buses at the bus stop.
A. wait for
B. waited for
C. will wait for
D. are waiting for
答案:
A. wait for
B. waited for
C. will wait for
(答案→)D. are waiting for
解析:根据中得关键词look可知,此句要用现在进行时,又因many people是复数,故系动词be要用are,动词wait 是不及物动词跟宾语时要用介词for,故选D。