He made a living ___ teaching.
A．withB．byC．toD．over
B
本題考查介詞。從句意判斷，應(yīng)該使用表示方式的介詞短語。故選B。介詞by可以表示“方式，手段”。如：We can learn English by using it.我們可以通過使用英語來學(xué)習(xí)英語。
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