问题
It is difficult for us to learn a lesson in life______ 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
If Icould help___,I needn’t have taken trouble to send the broken computer to therepairing centre.
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1.－Do youwant tea or coffee － _____. I really don’t mind.
I didn’t hear you come in just now.— That’s good. We tried ________ any noise.