16. (单选题) His success was due to _______ he had been work hard.(本题3.5分) A、 that B、 the fact which C、 the fact that D、 the fact of

16. (单选题) His success was due to _______ he had been work hard.(本题3.5分)
A、 that
B、 the fact which
C、 the fact that
D、 the fact of

出自：河套大学-大学英语二

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