【題目】Helen was about to walk out of the door________ the telephone rang.

A.whenB.thenC.whileD.that

【答案】A

【解析】

考查固定句式。句意：海倫正要出門，這時突然電話鈴響了。be about to do when…是固定句式，表示“正要……這時（突然）某事發(fā)生”，故A項正確。

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