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4. d
只有d. possible 才能使句子同前一句It couldn't be used then 意思最接近。a. able (能)需要人作主语,本句的主语是it 形式主语;b. allowed(允许)不符合题目的意思, c. impossible(不可能的)与句子意思相反。
9. a
b. number 只能修饰可数名词,不能修饰不可数名词money, c. some不符合语法,意思不成立; d. piece 只能修饰不可数名词,但是不能修饰money.只有a. amount(很多,一大笔)表示金额,可以修饰money.
a large amount of很多,一大笔,表示金额,a number of是只用于可数名词
只修饰可数名词的有:
many
many a +单数名词
more than one +单数名词
a great/good many
a good/great/large number of
quite a few
只修饰不可数名词的有
much
a great deal of
a large amount of
large amounts of
quite a little
既可修饰可数名词又可以修饰不可数名词的有
a lot of = lots of
plenty of
a large quantity of
large quantities of
a mass of=masses of
tons of
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