问题
It is difficult for us to learn a lesson inlife_________we’ve actually had that lesson
A:the; an
B:an; 不填
C:an; an
D:不填; the
B:an; 不填
C:an; an
D:不填; the
正确答案是：
同类题型
Have you worked here since you graduated?—No, I ________ at a factory in Beijing for six years
you play the piano atthis time of the day I need a good rest for tomorrow’stest. — Sorry.
Do you like playing_________ Chinese chess—Yes. And I like playing __________ football，too.