问题补充:
is very important for us students to learn English well.
A. As
B. There
C. What
D. It
答案:
A. As
B. There
C. What
(答案→)D. It
解析:it作形式主语,后面的不定式作真正的主语。考查句型It is+adj.+for sb.+to do sth.。
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