Just then,another man, behind the first,spoke up，“Who are you?”.A. sittingB. to sitC. s

Just then,another man, behind the first,spoke up，“Who are you?”.
A. sitting
B. to sit
C. sat
D. having sat

(答案→)A. sittingB. to sitC. satD. having sat解析：sitting behind the first表伴随。由于不存在先后动作对照，故不能选择选项D。

我好好复习下