61. (单选题) The proposal ___we start doing the experiment two days earlier has been agreed upon by all.(本题1.0分) A、 which B、 what C、 that D、 of which

61. (单选题) The proposal ___we start doing the experiment two days earlier has been agreed upon by all.(本题1.0分)
A、 which
B、 what
C、 that
D、 of which

出自：陇东学院-大学英语(专升本)

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