By the time Billy was 6, he in the sea. A．had already swum B．was already swimming C．has already swum D．already
唐太宗时期，假设国家要在关中一带修建一项大型水利工程，这项工程的实施涉及众多机构，按照制度规定其运行程序是 A尚书省－中书省－门下省－工
下列叙述正确的是( )。 A．C3植物光合作用过程中的二氧化碳受体是3—磷酸甘油酸 B．C4植物光合作用过程中的二氧化碳受体是磷酸烯醇式丙酮酸 C．C3
— What does she look like? — She long straight black hair. A. is B. has C. have D. does
The girl in red is ___ her father than like her mother. A. much liker B. a great deal like C. much more like D. a lot like
芬必得是一种解热、镇痛及抗生素类药物的商品名，其主要成分是化合物对异丁基-α-甲基苯乙酸，药名为布洛芬，它有多种合成路线，下面是一种合成
It was ________ that the PLA men got to the earth-strike area. A. midnight B. at midnight C. until
晚清人李慈铭在《越缦堂日记》中有这样一段话：“二十七日戊子记：闻圆明园为夷人劫掠后，奸民乘之，攘夺余物，至挽车以运之，上方珍秘，散无
