AIDS is said() have been the biggest health challenge to both men and women in that area over the past few years.

This is the first time the students ______ to Hyde Park.A、have beenB、have been goneC、hav

It is often said that, provided we are not of the unfortunate minority of people who have

The research team is said______another important discovery in physical chemistry.A．having

Much _____ said about the problem but nothing _____ been done so far .A.were，hasB.is，has

The construction of the railway is said to have b

The construction of the railway is said to have b