问题
选择题
_______ Mr Dong is over 70, _______ he still looks very healthy. [ ]
A. Although; but
B. /; but
C. But; although
D. /; although
答案
答案：B
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_______ Mr Dong is over 70, _______ he still looks very healthy. [ ]
A. Although; but
B. /; but
C. But; although
D. /; although
答案：B
周期内所通过的路程；