Experiments of this kind ________in both the U.S and Europe well before the Second World War.
A.had conducted
B.have conducted
C.have been conducted
D.had been conducted
试卷相关题目
- 1---- Mr. Smith is said to have retired and he is living in the country now. ---- Yes. He ________ in our factory for 35 years! What a good worker!
A.had been working
B.had worked
C.worked
D.have worked
开始考试点击查看答案 - 2Mary said they __________with each other for six years before they got married.
A.has fallen in love
B.had fallen in love
C.had been in love
D.has been in love
开始考试点击查看答案 - 3As you can see,the number of cars on our roads________rising these days.
A.was keeping
B.keep
C.keeps
D.were keeping
开始考试点击查看答案 - 4—What do you think of his speech at the court? —Er..., sorry, I ________ about something else.
A.had thought
B.thought
C.was thinking
D.have been thinking
开始考试点击查看答案 - 5—Peter, where did you guys go for the summer vacation? —We ____ busy with our work for months, so we went to the beach to relax ourselves.
A.had been
B.have been
C.were
D.will be
开始考试点击查看答案 - 6The singer and dancer _______ asked to sing a song in public, and she agreed happily.
A.is
B.was
C.are
D.were
开始考试点击查看答案 - 7His novels sell best and have made him famous, but before that no one could have imagined how great a role he ______ in the literary world.
A.had played
B.has played
C.is playing
D.was to play
开始考试点击查看答案 - 8- How could I thank you enough? - Don't mention it. Any other man_______that.
A.would do
B.will do
C.would have done
D.must have done
开始考试点击查看答案 - 9It's great that all the visitors who _______ on the island were saved.
A.trapped
B.have been trapped
C.had trapped
D.had been trapped
开始考试点击查看答案 - 10I _______ up here night after night for weeks now. You see, I _______ to give you a surprise.
A.have come; hoped
B.have been coming; has hoped
C.have come; was hoping
D.have been coming; was hoping
开始考试点击查看答案