新概念英语中的几个问题~

题目

新概念英语中的几个问题~
第三册中有这个题目：The experts were now fully convinced that
the animal ____ a puma
A.must be B.should have seen C.can only be D.could only have been.
我选择是是A 但答案是D为什么啊
还有个.The woman saw"a large cat "___five yards away from her.
A.at least B.four or .C,no more than D.within
为什么不选择D啊,C为什么有可以.
I——it all night.but I'm afraid ...
A.shall mend B.am mending C.have mended D.mended
为什么不选择A
We will get used to ___ that .BILL
A,hearing B.hear C.the sound D.having heard

答案

1主句是过去事态,A是表示对现在情况的肯定D是表示对过去事情的猜测把could only换成 must也可建议你看一看对过去事情猜测的表达方法.2The woman saw"a large cat "five yards away from her.这句话本身就完整five ya...