【題目】The People's Republic of China was founded October 1st1949. We'll celebrate its 70th anniversary this year.

A. inB. onC. at

【答案】B

【解析】

句意:中華人民共和國(guó)成立于1949101日。今年我們要慶祝它70周年。

A. in在……,后跟一天中的上午,下午或晚上,或跟某年某月某個(gè)季節(jié);B. on在,后跟具體的日期,或節(jié)日或星期幾;C. at后跟具體的時(shí)間點(diǎn)。October 1st,1949.是具體的日期,這里用介詞on。根據(jù)題意,故選B。

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