【題目】I have dancing classes every Saturday. They start _________ 8 o’clock.

A.atB.onC.inD.to

【答案】A

【解析】

句意：我每個星期六都上舞蹈課。舞蹈課8點開始。

考查時間介詞。A. at指“某一具體時刻（即幾點幾分時）”或表示“在中午、在夜晚、在周末”時或很短的時間；例如，at six/at that time/at night/at the moment；B. on“在具體的某一天”或“（在具體的某一天的）早上、中午、晚上”；例如，on May 10th 1982，on a rainy morning； C. in在較長的時間里用介詞in，例如，在某年/月/季節(jié)/在某世紀(jì)/在某年代或特定世紀(jì)某年代/在早上、下午、晚上等（in 1967/in May/in winter/in the eighteenth century/in 1970s’/in the morning）；表示“從現(xiàn)在起一段時間以后，須用介詞in；即“in+時間段”，要用于一般將來時；D. to：到，朝。本句指在“8點鐘”， 指“某一具體時刻（即幾點幾分時）”，故用介詞at；選A。

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