单选题
27.
They helped us many times, ______ very kind of them.
A、
who were
B、
which were
C、
that was
D、
which was
【正确答案】
D
【答案解析】
[考点] 定语从句和主谓一致
分析句子结构可知，逗号之后为非限制性定语从句，关系代词指代前面的整个句子，所以要用which来引导从句，且谓语动词要用单数形式。故选D。
他们帮助了我们许多次，他们可真善良。
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