【題目】Tom usually goes fishing ____Sunday morning.

A. on B. at C. in D. /

【答案】A

【解析】試題分析：句意：湯姆通常在周日上午去釣魚。在具體的一天用介詞on；在上午，下午或晚上用介詞in；在某一天的上午，下午或晚上用on；根據(jù)題意。故選A。

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