a mass of是什么意思We took _____ pictures of themA> many of B. masses ofc. a large amount of 为什么是用a mass of ?

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a mass of是什么意思We took _____ pictures of themA> many of B.  masses ofc. a large amount of 为什么是用a mass of ?
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a mass of是什么意思We took _____ pictures of themA> many of B. masses ofc. a large amount of 为什么是用a mass of ?
a mass of是什么意思
We took _____ pictures of them
A> many of
B. masses of
c. a large amount of
为什么是用a mass of ?

a mass of是什么意思We took _____ pictures of themA> many of B. masses ofc. a large amount of 为什么是用a mass of ?
首先,A错,直接用many 就可以了,of 是多余的
C a large amount of 只能修饰不可数名词,而picture可数,故,C错,
综上所述,正确的答案为B