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______ the ancient Egyptians built the pyramids puzzled people for centuries.

A．Whether          B．What             C．How             D．Where

. ______ the ancient Egyptians built the pyramids puzzled people for centuries.

______ the ancient Egyptians built the pyramids puzzled people for centuries.

　A. Whether                    B. What       

  C. How                        D. Where

______ the ancient Egyptians built the pyramids puzzled people for centuries.

　A. Whether     B. What             C. How                 D. Where

. ______ the ancient Egyptians built the pyramids puzzled people for centuries.

　 A. Whether                B. What              C. How                    D. Where

______ the ancient Egyptians built the pyramids puzzled people for centuries.

　 A. Whether                B. What              C. How                    D. Where