题目内容

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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