问题
选择题
The bad weather made ____ difficult for the birds ______.
A．it; migrate
B．that; migrate
C．that; immigrate
D．it; to migrate
答案
答案：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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