He( )with Smith at least four times in the past three years.

[单选题]He( )with Smith at least four times in the past three years.A.has been seen

[单选题]As a productivewriter,he [turned out] three novels these years.A.producedB.

[单选题]By the end of this year Mr. Smith _____in our company for exactly three yea

[单选题]A long time ago, I _______ in London for three years.A.had lived B.have liv

[单选题]A long time ago, I ________ in London for three years.A.had lived B.have li

[单选题]The operationcould [prolong] his life by two or three years.A.broadenB.wors

[问答题]()He has been learning English for years.

[问答题]He has been learning English for years.

[问答题]He has been learning English for years.

[问答题]The Olympic Games is an international sports event thattakes place every fo