题目内容

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

试题分析：句意：如果这台机器发生了什么事情，请让我们知道。Happen 常用于sth happen to sb/sth，某人/物发生了某事。当主句描述将来动作时，条件状语从句中常用一般现在时态表示将来的动作，故选B。
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