-what made Jim unhappy -___.-what made Jim unhappy-___.A.He had lost his watch B.Because he had lost his watch.C.His losing the watch D.For he had lost his watch.选什么?还要解释哦!

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-what made Jim unhappy -___.
-what made Jim unhappy
-___.
A.He had lost his watch B.Because he had lost his watch.
C.His losing the watch D.For he had lost his watch.
选什么?还要解释哦!

C
C 是名词词组 可以充当主语,相当于是His losing the watch made Jim unhappy.