Thousands of years ago people discovered the phenomenon by chance, and this was _____ the idea of the compass first came from.
A．howB．whatC．whereD．that
C
考查定語從句。句中the phenomenon為下文the idea of the compass first came from的邏輯地點(diǎn)狀語，故選C，where做from邏輯賓語，指代前文的the phenomenon。
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