问题
选择题
Simon thought his computer was broken _______ his little brother pointed out that he had forgotten to turn it on.
A．until
B．since
C．after
D．because
答案
A
本题考查连词。根据句意他一直以为电脑坏了，直到他弟弟告诉他忘记开机了；not...until...意为“直到……才”。
