Last summer I took a course on poisonous gases.
A. how to deal with
B. what to deal with
C. how to be dealt with
D. what to be dealt with
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(答案→)A. how to deal with
B. what to deal with
C. how to be dealt with
D. what to be dealt with
解析：考查固定搭配。固定搭配how to deal with sth=what to do with sth如何处理某事；句意：去年夏天，我参加一个关于如何处理有毒气体的课程。故A正确。