How long should a student be at school in most states according to the law？A．Twelve years.

— How long _____ at this job？ — Since 2000.A、were you employedB、have you been employedC、

According to some estimates, at most for how long can we use the fossil fuel reserves？A．20

How long did Ms. Makestos work at International Films？A．One summerB．Three summersC．One yea

How long did Ethbell teach minority students？A．8 years.B．16 years.C．20 years.D．30 years.

How long should applicants be prepared to stay at the Embassy？A．About half an hour.B．Appro

How long has Ethbell taught minority students?A.8 years.B.20 years.C.16 years.D.30 years.