______ the ancient Egyptians built the pyramids puzzled people for centuries.
A．WhetherB．What
C．HowD．Where
C
本題考查主語從句。句意：古埃及人是如何建造金字塔迷惑了多少代的人。how在此引導(dǎo)主語從句，在句中作狀語。
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