Allthesegiftsmustbemailedimmediately

來源：國語幫 1.98W

All these gifts must be mailed immediately _______ in time for Christmas.

A．in order to have received B．in order to receive

C．so as to be received D．so as to be receiving

解析：本題考查了不定式作目的狀語的用法。so as to用於句中，且其後的動詞和它的句子的主語存在被動關係，需採用不定式的被動形式。