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：如果這臺機器發(fā)生了什么事情，請讓我們知道。Happen 常用于sth happen to sb/sth，某人/物發(fā)生了某事。當主句描述將來動作時，條件狀語從句中常用一般現(xiàn)在時態(tài)表示將來的動作，故選B。
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