Yesterday morning I was just leaving_______ the telephone rang.
A．whenB．whileC．becauseD．since
A

試題分析：句意：昨天早上我正要離開時電話鈴響了。When當…時；while當……時； because 因為；since自從。表示某事正在進行時發(fā)生了另一件事，常用when，所以選A。
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