13．-I called your office at about ten this morning，but there was no reply．
-Oh，that was probably_______ I was paying a visit to a friend in hospital．（　�。�
A．whenB．whyC．whatD．that

分析 --我今天早晨大概10點鐘給你辦公室打電話，但是沒有人接．
--哦，那個時候我很可能在醫(yī)院看望一位朋友．

解答 答案為A．本題考查名詞性從句中引導(dǎo)詞的運用．題干空格后面是was后面的表語從句，根據(jù)語境，你打電話的時候我在看望朋友，表示的是時間，所以需要表示時間的引導(dǎo)詞，故選A．

點評 名詞性從句考查的關(guān)鍵是連接詞的選用和語序，因此，我們首先要搞清從句的性質(zhì)，掌握各連接詞的用法，在此基礎(chǔ)上判斷．此外，關(guān)注名詞性從句用陳述語序．

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