A.Directlytotheleftandrightandslightlyinfrontofthelistener
B.Directlytotheleftandrightandslightlybehindthelistener
C.Aboveandbehindthelistener
D.Directlybehindthelistener
参考答案：B
ADirectlytotheleftandrightandslightlyinfrontofthelistenerB
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