—What made Alice so upset?—.A. Peter’s leaving without saying goodbyeB. Peter left without

—What made Alice so upset?
— .
A. Peter’s leaving without saying goodbye
B. Peter left without saying goodbye
C. Peter was leaving without saying goodbye
D. Peter had left without saying goodbye

(答案→)A. Peter’s leaving without saying goodbyeB. Peter left without saying goodbyeC. Peter was leaving without saying goodbyeD. Peter had left without saying goodbye解析：考察动名词做主语。本题所回答的句中相当于原句中的what，在句中作主语。第一空使用的动名词的复合结构做主语，动名词的复合结构有两种“所有格+doing”和“宾格+doing”；做主语的时候，只能使用“所有格+doing”。B项前面缺少了主语从句的引导词。句意：—什么让Alice如此难过？—Peter没有说再见就离开了。故A正确。

感谢回答