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

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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
英语问题Nuclear radiation is said _____ the biggest health chall
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.
英语翻译AIDS is said------the biggest health challenge to both m the residual nuclear radiation still badly has endangered th (_____ ) is the biggest city fo UK (_____ ) is the biggest city fo Australia (_____ ) is the biggest city fo Canada AIDS is said to have been the biggest We must to something to stop the serious nuclear radiation f 一个英语问题 Stanley Park is the biggest city park of the world.这句 快翻一下这句话 英语Russia's nuclear chief has said the country's over Aids is said_____ the biggest health challenge to both men a (_____ ) is the biggest city fo Austeralia (_____ ) is the b His health is _____