◎ 题干
This is _____ each year a great number of people from all over the world try to immigrate to California.

[     ]

A. when
B. what
C. why
D. that
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“帮助问句选择合适的答语。( ) 1. How many story-books do you have? ( ) 2. Who is your best friend? ( ) 3. What colour is your schoolbag? ( ) 4. Do you like …”主要考查了你对  【连接副词】【表语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。