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[单选题]
They overcame all the difficulties fulfilled the project seven days ahead of schedule,__________ was something we had not expected.
A
that
B
this
C
it
D
which
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试题答案：
D
答案解释：
考查定语从句：逗号前是主句，后面是从句。语法上称为“非限制性定语从句”。只有which正确。B、C两项不能引导从句；A项that不能引导非限制性定语从句。
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After Man has dreamed about flying for a long time.Michael Moshier is a dreamer.He invented the Solo Trek.The Solo Trek had a 120 horsepower engine with twin fans.Only one person flies.As you fly above the roofs, you lean a little forward.You can see everything under you.You are flying like Superman.Michael Moshier looked at the jet belt and the rocket belt that was developed 20-30 years ago Nothing ever came from them.People still can't fly.Inventors have tried to make it easy for people to fly.Paul Moller has been working on his flying car for 30 years.He now says it is ready for tests.It would take off and land vertically, go600 miles an hour, and deliver 20 miles to the gallon.A computer would do the actual flying.He says it could be sold next year for about a million dollars.NASA is working with Moshier to help develop his flying machine.The first users are likely to be military.It's been 50-years since Robert Fulton invented his airphibian, a flying car.It flew, and is now in the Smithsonian Museum.Getting dreams to fly is never easy.
请选择出最佳答案填入（ ）。 查看材料
第27答案是（ ） 查看材料
27.A.dirty B.dark C. clean D.hot
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