The thief entered the room without ( )A.noticing B.being noticed C.having noticed D.having been noticed

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Thethiefenteredtheroomwithout()A.noticingB.beingnoticedC.havingnoticedD.havingbeennoticedThethiefent

The thief entered the room without ( )A.noticing B.being noticed C.having noticed D.having been noticed
The thief entered the room without ( )
A.noticing B.being noticed C.having noticed D.having been noticed

The thief entered the room without ( )A.noticing B.being noticed C.having noticed D.having been noticed
B.being noticed
伴随状态且为被动

B without后面跟动名词短语作介词宾语,同时此处需要被动语态,介宾短语作伴随状语~