Several centuries ago people did not believe that the earth______round the sun.
A.revolved
B.had revolved
C.revolves
D.has been revolving
第1题
In recent years, a number of communication satellites ______ into orbit about the earth.
A.have been put
B.has been put
C.are already put
D.have been putting
请帮忙给出正确答案和分析,谢谢!
第2题
Attention should______practice in production in addition to theoretical study.
A.be also paid
B.have to also paid
C.be also paid to
D.have to also pay to
请帮忙给出正确答案和分析,谢谢!
第3题
When he was the director in the plastic plant, he ______ together with the workers.
A.has worked
B.had worked
C.had been worked
D.used to work
请帮忙给出正确答案和分析,谢谢!
第4题
Nancy is so poor that even thirty dollars______a big sum to her.
A.is
B.are
C.be
D.being
请帮忙给出正确答案和分析,谢谢!
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