问题
选择题
Like some of my classmates,I cannot live up to my teachers'expectations; ________I let them down.[ ]
A. in other words
B. after all
C. what's more
D. more or less
答案
答案：A
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Like some of my classmates,I cannot live up to my teachers'expectations; ________I let them down.[ ]
A. in other words
B. after all
C. what's more
D. more or less
答案：A
，其中D是由x2+y2=4与x2+(y+1)2=1围成的区域．