答案:
1.berecycled
2.about
3.between
1.本句含义“废弃的纸可以回收利用嘛?”
Canpaper(thatisthrewaway)berecycled?
thatisthrewaway是修饰paper的,可以不看,抓主干部分:Canpaperberecycled?变为陈述句就是:Papercanberecycled.这样好理解了吧.
2.本句含义:他在考虑下面该说些甚么.
thinkabout“考虑”,固定搭配;thinkof更侧重于“回想起来”,不符合题意.
3.本句含义:请保守这个秘密,只有你知,我知.
between...and...两者之间;若三者或三者以上之间用among