it is suprising to know that large quantities of waste __ put into the river every year.rtA.is B.wasC.wereD.are为什么

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it is suprising to know that large quantities of waste __ put into the river every year.rtA.is B.wasC.wereD.are为什么
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it is suprising to know that large quantities of waste __ put into the river every year.rtA.is B.wasC.wereD.are为什么
it is suprising to know that large quantities of waste __ put into the river every year.
rt
A.is
B.was
C.were
D.are
为什么

it is suprising to know that large quantities of waste __ put into the river every year.rtA.is B.wasC.wereD.are为什么
A
让人吃惊的是,每年有大量垃圾被投入河流.
"每年”一般式,waste垃圾,不可数名词,故用A

D

选d 这种结构要看中心词的单复数 而中心词quantities 是复数 所以选d 因为这是陈述一个事实 所以用一般现在时

B