be based on/upon...以……为基础;基于……之上 Direct taxation is usually based on income. 直接征税通常以收入为依据。 base vt. 基于,以……作基础
n.
基础;总部 base A on B
把A建立在B的基础上 at the base of
在……的根基,在……的底座 basis n.
基础;根据 on a...basis
以……为基准(介词短语,用作状语 (3)basic adj.基本的 They
the conclusion
facts. 他们在事实的基础上得出结论。 They cooperate with each other on a friendly basis. 他们友好合作。 based on 3.The film,________the true story of this Red Army
general,attracted people's interest all over the country.
A.is based on
B.is on the base of
C.which is the base for
D.based upon 解析:由于attracted为本句的谓语,因此A、B两项不正确。based upon...为过去分词作定语修饰the film,相当于一个定语从句,which was based upon...。 答案:D ...but it took 50 years before 66 per cent of American households had it. ……但花了50年时间66%的美国家庭才得以拥有它。 before在此译为“……才……”。 before的译法灵活,具体如下: (1)趁……未,以免 I had better go now before it is too late. 我最好现在就走,免得太迟。 (2)……才,……就 常用句型it is/was/will be+一段时间+before Will it be years before he goes to school? 要过好几年他才能上学吗? It was not long before he left for the United States. 不久他就去美国了。 (3)在……前 He had learned some Chinese before he came to China. 他来华之前,学过一些汉语。 before long=soon不久 long before很久以前 It is/will be+时间段+before从句,“要过多久才”(before从句用一般现在时)It was+时间段+before从句,“过了多久才”(before从句常用一般过去时) It won't be +时间段+before从句,“不用过多久就会……”(before从句用一般现在时))It wasn't+时间段+before从句,“没过多久就……了”(before从句常用一般过去时) (1)(2010·如皋统考)—How long have you been studying in
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