在很多情况下，for语句和while语句可以等价使用。
查看答案
如果在一个函数的定义中调用了该函数本身，这就是函数的嵌套调用。
A. 对
B. 错
Between the two roads ________ a TV tower called“Skyscraper Tower”.
A. stands
B. standing
C. which stands
D. stand
You as well ________ right.
A. I are
B. I am
C. as I am
D. as I are
Where to get the materials and how to get them ________ at the meeting.
A. have not discussed
B. have not been discussed
C. has not discussed
D. has not been discussed
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