They don't know what---A.is in their bagsB.in their bagsC.in their bags isD.in their bags are

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They don't know what---A.is in their bagsB.in their bagsC.in their bags isD.in their bags are
They don't know what---
A.is in their bags
B.in their bags
C.in their bags is
D.in their bags are

They don't know what---A.is in their bagsB.in their bagsC.in their bags isD.in their bags are
D 状语提到前面来了in their bags

D

D

A

选A

一定是A,其他的都不顺。