Two chinese astronauts_____around the earth for 5 days.
题目
Two chinese astronauts_____around the earth for 5 days.
A.have flown B.has flown C.fly D.flying
答案
a hint from the sentense:forso you have to use perfect tense in many of the cases.then only A and B are possible choice.However,the word "astronauts" is in plural form.You have to use the correct form...
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