问题
选择题
Yuan Longping ____ an 
idea for a hybrid rice in the 1960s.[ ]
A. caught up with
B. fell behind
C. came up with
D. put up with
答案
答案：C
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Yuan Longping ____ an idea for a hybrid rice in the 1960s.[ ]
A. caught up with
B. fell behind
C. came up with
D. put up with
答案：C
