问题
选择题
-The light in the office is still on.
-Oh, I forgot __________.
A．turning it off
B．to turn it off
C．turning it on
D．to turn it on
答案
答案：B
考査 forget to do sth. 和 forget doing sth. 的区别。由“办公室的灯仍然开着”可知，我忘记关灯了。故答案为B。