单选题 Scarcely ______ when it began to rain.
A. did he return B. had he returned
C. he did return D. he had returned

【正确答案】 B

【答案解析】[解析] 表示否定意义的词放在句首作状语时，要用倒装结构。过去完成时常用于nosooner…than和hardly(scarcely)…when(before)等句型的主句中，从句常用一般过去时。no sooner，hardly(scarcely)置于主句句首时，主句要求用倒装语序。