英语问题Nuclear radiation is said _____ the biggest health chall

英语问题
Nuclear radiation is said _____ the biggest health challenge in Japanese Earthquake over the past few months
A being B to be Cto have been Dthat it is
那个C have been 表示什么意思啊为什么不能选B

xojune 1年前已收到2个回答举报

bbsiji 幼苗

共回答了16个问题采纳率：81.3% 举报

to have been 意思是已经成为
之所以用to have been是因为跟句末的over the past few months.这是从过去到现在的一段时间,应当与完成时搭配
过去几个月以来,核辐射已经成为.

1年前

风云再现1 幼苗

共回答了2个问题举报

havebeen是现在完成时

1年前

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