It is a mystery how early man build the Pyramids without the use of modern machines. A. could B——青夏教育精英家教网—

摘要： It is a mystery how early man build the Pyramids without the use of modern machines. A. could B. was able to C. would D. had to

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It is a mystery how early man ______ build the Pyramids without the use of modern machines.

A. could　　　　　　　　　　 B.was able to　　　　　　 C.would　　　　　　　　　　 D.had to

A. could　　　　　　　　　　 B.was able to　　　　　　 C.would　　　　　　　　　　 D.had to

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