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The bad weather made ____ difficult for the birds ______.
A.it; migrateB.that; migrateC.that; immigrateD.it; to migrate
D
考查代词。句中it作形式宾语,真正的宾语为不定式to migrate。句意:坏天气使得迁徙的鸟儿变得很难。
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