They were about to leave       it began to rain.
A．beforeB．durningC．whileD．when
D

試題分析：考查連詞。be about to do sth...when...,正要做某事的時(shí)候，這時(shí)（突然）...。A.before在...之前，趁...還未，不等...就  B.durning在...期間  C.while 當(dāng)...的時(shí)候，盡管 D.when當(dāng)...的時(shí)候，這時(shí)（突然）。句意：他們正要離開(kāi)時(shí)，天開(kāi)始下雨。
點(diǎn)評(píng)：本題要注意特殊句型結(jié)構(gòu)：be about to do sth...when...,正要做某事的時(shí)候，這時(shí)（突然）...。類(lèi)似的還有：be doing sth...when...，正在做某事的時(shí)候，這時(shí)（突然）...。
即學(xué)即練：I was about to get out the room       the door was opened ．
A.when      B.while     C.before    D.as
選A
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