关于can与beableto区别的几道题1.thescenerywasbreathtaking!I'msogladthatwegorock-climbingtogether.A.couldn'tB.canC.wereableto2.I'mbeat!Imoveanotherinch!A.I'mabletoB.IwasabletoC.Ican't3.I'mafraidofheights,so

Question

关于can 与be able to区别的几道题
1.the scenery was breathtaking!I'm so glad that we_____go rock-climbing together.
A.couldn't
B.can
C.were able to
2.I'm beat!I ____move another inch!
A.I'm able to
B.I was able to
C.I can't
3.I'm afraid of heights,so I ____climb that mountain.
A.can't
B.am not able
C.could
并说明为什么.谢过
第二题。我当初选的C 结果被外教判错。所以才到这里来。
第一题我能肯定答案是C
第二题我只想知道答案是什么，为什么不是C。
第三题。我觉得应该是A 但是被判错。我觉得可能是B，但是好像有这么个be able to do 或者是 be not able to do所以也不肯定是B还是C。请说明原因。

Answer 1

1.C 因为时态为过去时,所以用C
2.C根据语境,应市否定
3.B因为be able to更倾向于有什么能力,而can侧重于能怎样