the leaders ___us in our discussion ,but owing to more important business they could not come.

题目

the leaders ___us in our discussion ,but owing to more important business they could not come.
A were to join B were to have joined C had been to have joined D was to join
为什么选A?

答案

首先排除D项,因为主语是多个领导人,显然“was”不是合适的谓语动词再次排除C项,因为这种说法完全不存在.再说B项,"were to"表示将来时,表示过去情态下对将来的预期等,"have joined"则指现在时态下的完成时,所以时态混...