The reason Mr．Wang didn’t join us was that his wife was ill．A.whichB.whyC.thatD.
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The reason ________ Mr．Wang didn’t join us was that his wife was ill．
A.which
B.why
C.that
D.because
试题答案
B
解析：当先行词为the reason时，定语从句可能用that/why/for which来引导，在本句中，定语从句成分完整，选用why/for which来引导。