Why Maria didn’t come to school yesterday______not known.

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问题 Why Maria didn’t come to school yesterday______not known.

选项 A、were
B、are
C、is
D、have been

答案C

解析 语法题。本题考查主谓一致的用法。该句是一含有一主语从句的主从复合句。主语从句担任主语时,谓语动词需用动词单数形式,故选C。类例如:What is hard is to do good all one’s life and never do anything bad.Whatever had been said at the meeting was kept secret.It doesn’t seem likely that she can finish her homework as required.(此处用了形式主语it.)
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