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Under his arm __ a pair of shoes which he had bought from th

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Under his arm __ a pair of shoes which he had bought from the shop a few days previously.
Under his arm __ a pair of shoes which he had bought from the shop a few
days previously.
A.is B.are C.were D.was
请说明理由,
答案的确应该是D,was

后面的定语从句的助动词用的是“had(done)“,是一种在过去完成时的情况下出现的助动词”have“的变形,所以主句应该用相对应的一般过去时(因为过去完成时是”过去的过去“,必须在与一般过去时对比的情况下实用,以显示它是比(一般)过去时还要再”过去“的时态)

(这里还涉及一个状语提前的完全倒装形式,所以整个谓语部分必须在主语之前.又因为谓语部分只有一个be动词,”a pair of shoes was under his arm...“,所以只把was提前看似像是只提前了助动词)”a pair of shoes“是单数没错,要不怎么回事”a“,(这个在雅虎上问过了是”singular“没错).

所以最后选用”“” be动词的一般过去式的单数形式“”“就是”was“