问题补充:
.It took them half an hour to go the crowd.
A. through
B. across
C. cross
D. out
答案:
(答案→)A. through
B. across
C. cross
D. out
解析:through表示从中间通过;acoss表示通过时,是在接触面的通过;cross是动词“穿过”,本题不需要动词;out“外面”,与题意不符。又因为,the crowd是“群众”,应该从中间通过,故用through,所以本题选A。