单选题 Scarcely had he hung up the phone ______ it rang a second time.
A. but B. as
C. than D. for

【正确答案】 C
【答案解析】[解析] ＜Scarcely had+主语+p.p. than主语+动词过去式＞意思是“一……就……”，所以空格处应该填入C项than。还可以用No sooner，Hardly来代替Scarcely。
词汇：hang up挂断(电话)/ring铃声响了