问题: 语法题
The problem ( ) an important one.
A.referring to be B.referred to is
C.referred to be D.having referred to is
解答:
The problem ( ) an important one.
A.referring to be B.referred to is
C.referred to be D.having referred to is
B
The problem （that was）referred to is an important one.
补全你就看得懂了吧？是一个省略后的定语从句。
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