执行M99后，子程序结束，不返回主程序。
A. 对
B. 错
若子程序内无M99，则执行子程序结束时，可能会报警或出错。
A. 对
B. 错
The edible mushroom ____ a cushion-like, moist cap that is light brown or darkish red.
A. which has
B. to have
C. having
D. has
_____ full preparations, we decided to put off the meeting till next week.
A. We had not made
B. Having not made
C. Not made
D. Not having made
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