A.for
(be being substituted for取代)
A.lead to导致
(B.cause vt.)( C.result in)(D.give vt.)
9.In manufacturing,cheaper materials are constantly being substituted ___________ the better,more expensive kind.
9.In manufacturing,cheaper materials are constantly being substituted ___________ the better,more expensive kind.
A.for B.by C.with D.out
10.A bad cold may _______ to pneumonia.
A.lead B.cause C.result D.give
A.for B.by C.with D.out
10.A bad cold may _______ to pneumonia.
A.lead B.cause C.result D.give
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