He has forgotten what ______ are involved and the time taken ______ delivery. ( )

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He has forgotten what ______ are involved and the time taken ______ delivery. ( )
A.formalities, in
B.procedures, for
C.formalities, for
D.procedures, in

本题关键词:HE染色切片,肠内营养乳剂(TP-HE),瑞高(肠内营养乳剂 (TP-HE));