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multiple question

SYNTAX: Question with more than one wh-phrase. EXAMPLE: Who bought what? In English, a multiple question has all but one of its wh-phrases in situ, since only one wh-phrase may be fronted (see wh-in-situ). Some languages display multiple wh-fronting.
LIT. Chomsky, N. (1986b)
Chomsky, N. (1981)