--How's your tour around the North Lake Is it beautiful?--It _____be,but it is now heavily polluted.A will B would C should D must为什么不是B啊

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--How''syourtouraroundtheNorthLakeIsitbeautiful?--It_____be,butitisnowheavilypolluted.AwillBwouldCsho

--How's your tour around the North Lake Is it beautiful?--It _____be,but it is now heavily polluted.A will B would C should D must为什么不是B啊
--How's your tour around the North Lake Is it beautiful?
--It _____be,but it is now heavily polluted.
A will B would C should D must
为什么不是B啊

--How's your tour around the North Lake Is it beautiful?--It _____be,but it is now heavily polluted.A will B would C should D must为什么不是B啊
should 表示本来应该怎样但现实并非如此你可能比较熟悉should have done本来应该做而没有做此处表它本应该美丽但它现在被污染了

C
无论如何也不可能是B的。。
答者的意思是，North lake 本应是beautiful的，可是已被严重污染。。

不可能是他愿意……所以是C would是 will过去式，句型一般为would like to do

此题实为一个虚拟语气的考点，It _____be,but it is now heavily polluted，其实与if it were not heavily polluted now, it would be beautiful. 是一样的，是对现在时态的虚拟。