题目内容
______ the ancient Egyptians built the pyramids puzzled people for centuries.
| A．Whether | B．What | C．How | D．Where |
C
解析试题分析：考查主语从句的引导词。根据句意：古代埃及人怎么建造的金字塔困惑了人们好几个世纪。所以答案选C。
考点：考查主语从句的引导词
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| A．since | B．until |
| C．because | D．unless |
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| A．because | B．unless | C．when | D．though |
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| A．when; what | B．that; when | C．that; whatever | D．when; what |
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| A．If | B．As | C．Unless | D．When |
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| A．until | B．before | C．as | D．unless |
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| A．what | B．it | C．as | D．which |
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| A．how | B．which | C．that | D．what |
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| A．after | B．when | C．until | D．before |