After several years of observation, the research group ______ the conclusion tha

题型：同步题难度：来源：

After several years of observation, the research group ______ the conclusion that language acquisition is
faster when students ______ to the situation where it is spoken.[     ]
A. has come to; expose
B. have arrived at; are exposed
C. has concluded; are exposed
D. have reached; expose

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举一反三

My father _______ to Shanghai. He _______ for over 2 months. [     ]
A. has been, has left
B. has gone, has gone
C. has gone, has been away
D. has been, has gone

题型：河北省模拟题难度：| 查看答案

Progress ________ so far very good and we are sure that the work will be finished on time．[     ]
A．was
B．had been
C．has been
D．will be

题型：江苏模拟题难度：| 查看答案

- _______ David and Vicky _____ married?
- For about three years.[ ]
A. How long were; have been
B. How long have; have been
C. How long have; been
D. How long did; get

题型：同步题难度：| 查看答案

She knows so much about England. She _____ there before.[     ]
A. must be
B. must live
C. must have been
D. must have lived in

题型：同步题难度：| 查看答案

Mum, I arrived at the train station twenty minutes ago, but Betty up yet.[ ]
A. hadn"t turned
B. won"t turn
C. hasn"t turned
D. didn"t turn

题型：四川省模拟题难度：| 查看答案