题目内容

He kept smiling secretly and we were all wondering      that made him so happy.
A.how it didB.what he did
C.how it wasD.what it was
D
本题考查强调句。本题考查强调句的特殊疑问句形式。宾语从句中缺少主语,故用what。根据句意选择D。
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