问题

Scientists think they have ____ in their attempt to find the causes of some major disease.

A: broken through
B: worked through
C: got through
D: gone through

正确答案是：

同类题型

Peter________alittlemoneyeverymonthsothathecanbuyacarofhisowninthenearfuture.

－Why did you arrive late?(成都市)－The fog_______ our air flight for about half an hour.

Those poor people don’t have enough ____________.They feel （感觉）hungry.

Had he worked harder, he ________ the exam.[ ]

Jack, how are you feeling now—-I am much better, Mum, so you ______________ take me to see the doctor.