I regret ______ that last week.
A. to have done
B. having done
C. to do
D. to being doing
查看答案
They insisted on ______ tomorrow.
A. being finished the design
B. the design finished
C. the design being finished
D. the design to be finished
He apologized for ______.
A. his not being able to come
B. his being able not to come
C. not his being able to come
D. his being not able to come
Now, I've got quite used to ______ in this computer company.
A. work
B. worked
C. working
D. to be working
已知函数f(x)为区间(−1,1)上的奇函数且可导, 则f'(x)为(−1,1)上 的偶函数.
A. 对
B. 错
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