Question

【题目】—I'm sorry to keep you ________ too long. The bus was ________ crowded that I couldn't take the first bus.
—It doesn't matter.
A.to wait, so
B.waiting, so
C.waiting, too

Answer 1

【答案】B
【解析】句意：——我很抱歉让你等这么长时间。这辆公交车如此拥挤以致于我无法赶上第一班公交车。——没关系。keep sb/sth doing sth“让某人/某事一直做某事”，so+形容词/副词+that+从句“如此……以致于……”，故选B。