.He is said________a book on the history of Chinese tone bridge , but I don’t know if he has finished it.
A. to have written B. to be writing C . having writing D writing
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| A．that； when | B．when； that | C．then； that | D．that； then |
Sor
ry， I didn’t hear you. I to the music.
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| A．what | B．which | C．th at |
D．though |
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