Half of the workers here ________ under 30 ________.
A.is;years B.are;year old C.is;years old D.are;years of age
Half of the workers here ________ under 30 ________.
A.is;years B.are;year old C.is;years old D.are;years of age
D
half作主语时,谓语要与half后面的名词保持一致。workers是复数,谓语也要用复数。