题目内容：

3.--- ____ the sports meet might be put off． --- Yes,it all depends on the weather．
　　A． I've been told B． I've told 　C． I'm told D． I told,但是想问下为什么不选C?
还有
4.I need one more stamp before my collection ___.
　　A.has completed B.completes 　C.has been completed D.is completed答案选D,为什么不选C?
5.Rainforests ___ and burned at such a speed that they will disappear from the earth in the near future.
　　A.cut B.are cut 　C.are being cut D.had been cut答案选C,而不选B?

优质解答

3.A 如果使用 I'm told 也应该是 I was told ,因为是发生过的事,用现在完成时还可以强调影响.
4.主句是一般现在时,从句一般也采用一般现在时.
5.C 表示正在进行,意义：雨林照这样的速度被砍伐下去很快就会从地球上消失.