About imported/exported stuff

quick question"
Suppose i have this:
A.swf - holds a MC exported for runtime sharing
B.swf - imports the MC in A.swf
C.swf - loads the B.swf

Here my question: From what i have read and experimented with the B.swf can only access the MC exported from A.swf. That works fine i can attach it to the stage and stuff. But C.swf cannot access the MC imported into B.swf. As far as i know, and from what i have read there is no workaround. Is this true?