_______ many times, he finally understood it.A.TaughtB.TeachingC.Having taughtD.

_______ many times, he finally understood it.A.TaughtB.TeachingC.Having taughtD.

题型:不详难度:来源:
_______ many times, he finally understood it.
A.TaughtB.TeachingC.Having taughtD.Having been taught

答案
D
解析

举一反三
Bush, before Barack Obama, _______ Brown a similar gift, a leather bomber jacket.
A.gaveB.have givenC.would give D.had given

题型:不详难度:| 查看答案
The manager had fallen asleep where he ______, without undressing.
A.was layingB.was lyingC.had laidD.had lied

题型:不详难度:| 查看答案
---Where were you when I called at your house this morning?
---Oh, I_____ for a friend from Tokyo at the airport.
A.had waitedB.am waitingC.have waitedD.was waiting

题型:不详难度:| 查看答案
---How can I apply for an online course?
---Just fill out this form and we______ what we can do for you.
A.seeB.are seeingC.have seenD.will see

题型:不详难度:| 查看答案
Merry________ as a secretary in the company for five years, but now she is a general manager of the company.
A.workedB.has workedC.is workingD.works

题型:不详难度:| 查看答案
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