When we say that we see light at the end of tunnel we mean that victory is() .

In the early morning light we could just see the dark forms of the mountains.（英译中)

When we say that we can change the second word in the sentence "The girl is waiting outsid

________（47）A.Experts say that we cannot do that

________（48）A.Experts say that we cannot do that

________（49）A.Experts say that we cannot do that

________（50）A.Experts say that we cannot do that