问题
Out of the crowded bus _____, who was dressed in a black suit and waved to a woman. [ ]
A: a tall man in his thirties stepped
B: stepped a tall man in his thirties
C: did a tall man in his thirties step
D: did a tall man step in his thirties
B: stepped a tall man in his thirties
C: did a tall man in his thirties step
D: did a tall man step in his thirties
正确答案是：
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