—Have you heard that George quit his job?
—Yeah, but I can't________why he did so.
A．put out　B．figure out
C．carry out　D．send out
B
　考查動詞詞組辨析。put out“出版，出產(chǎn)”；figure out“弄明白”；carry out“實施，執(zhí)行”；send out“發(fā)出，分發(fā)”。答句句意：是的，但我弄不明白他為什么要辭掉工作。
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Supporting details
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