问题描述：
it has ____the number of people for classical music to become much smaler than _____in the 1950s and earlier,and it is the most popular music now .
1.Amade B.let C.kept D.caused
2.A.one B.this C.that .D.it
应怎么填,为什么
1.Amade B.let C.kept D.caused
2.A.one B.this C.that .D.it
应怎么填,为什么
问题解答：
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