河南成教 / 当代英语语法概论
正确率:100%
13[单选题]
( ) that he had succeeded in designing a new device of laser, we came to congratulate him on his success.
A.Having been heard
B.To have heard
C.Being heard
D.Having heard
( ) that he had succeeded in designing a new device of laser, we came to congratulate him on his success.
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