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
本題考查強調(diào)句。本題考查強調(diào)句的特殊疑問句形式。賓語從句中缺少主語，故用what。根據(jù)句意選擇D。
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