When was it            you met him in the library?
A．a(chǎn)s B．thatC．whileD．if.
B

試題分析：考查強調(diào)句型。本題是強調(diào)句型的特殊疑問句，強調(diào)的是時間狀語，本題是對時間狀語的提問。句意：究竟是在什么時候你在圖書館里遇見他的？故B正確。
點評：首先，要知道強調(diào)句的結(jié)構It is/was+被強調(diào)部分+that+句子的其他成分，如果被強調(diào)的部分是人，可以用who代替that。具體是用is還是 was，要根據(jù)具體的時態(tài)確定。強調(diào)句的用法及判斷，一般說來，如果把句子中的It is/was…that去掉，稍加調(diào)整語序，能還原成完整的句子，并且句子意思依然完整，則為強調(diào)句型，否則為其他從句。我們應熟記這些基本規(guī)則。
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