问题
Learning to write is learning to think. You don’t know things clearly you can write them down.
A:unless
B:if
C:since
D:whether;
B:if
C:since
D:whether;
正确答案是：
同类题型
Out _________, still discussing the fashion show with great interest.
She has _____she remembers all the names ofthe students she has taught
Whenhewasold,MrSmith_____sitforhourswithoutsayinganything.
I prefer sports shows _____ soap operas. What about you–Me, too.
How happy you are to _______ good health and a lovely daughter!