Jim couldn’t understand how the machine worked until his friends____ how to use it.
A．promised B．explainedC．thought D．heard
B
考查詞義辨析。promised 答應(yīng)，允諾，explained解釋，thought認(rèn)為，heard聽(tīng)到，句意：吉姆不明白這臺(tái)機(jī)器如何工作直到它的朋友們解釋了如何使用。所以選B。
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