It was after he had made an investigation ________ he came to know the truth.
It was after he had made an investigation ________ he came to know the truth.
A.where
B.when
C.that
D.and
答案及解析： C
It was after he had made an investigation ________ he came to know the truth.
A.where
B.when
C.that
D.and
答案及解析： C