If anything         the machine, please let us know.
A．happens on B．happens toC．happened onD．will happen to
B

試題分析：句意：如果這臺(tái)機(jī)器發(fā)生了什么事情，請(qǐng)讓我們知道。Happen 常用于sth happen to sb/sth，某人/物發(fā)生了某事。當(dāng)主句描述將來(lái)動(dòng)作時(shí)，條件狀語(yǔ)從句中常用一般現(xiàn)在時(shí)態(tài)表示將來(lái)的動(dòng)作，故選B。
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