To my disappointment every possible means —— to prevent air

To my disappointment every possible means —— to prevent air pollution butthe sky is stillnotclea
A.are being used
B.have been used
C.has been used
D.had been used
选什么为什么

divv 1年前已收到3个回答举报

scopcc 幼苗

共回答了23个问题采纳率：100% 举报

C means:方式单复数同形,前面有every,所以这里是单数,又是强调过去动作产生的影响,所以用完成时

1年前

newjobs 幼苗

共回答了5个问题举报

d 令我失望的是所有可能的方法被用来防止空气污染是stillnotclea香甜的天空

1年前

canadian_cat 幼苗

共回答了1923个问题举报

B...
虽然这里用every ...但其实指的是“所有的”的意思。。。所以用复数。。

1年前

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