( ) 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.

A.Having been heard
B.To have heard
C.Being heard
D.Having heard

出自：当代英语语法概论

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