单项选择题

When asked to explain what has happened, John was totally at a loss for words.

A．要求约翰对发生过的事情进行解释时，他讲的话让人完全摸不着头脑。
B．让约翰解释发生过的事情时，约翰完全不知道说什么好。
C．由于约翰完全不知道发生过什么事，所以他就让别人解释给他听。
D．约翰自己要求要解释发生过的事情，到头来却又一句话也不肯说。
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