B as引导的定语从句需要一个谓语动词，选项中只有is可以
B，which引导非限制性定语从句，指代一件事情。
B，定语从句成分完整了，需要一个状语，先行词是时间，所以用when
D，all 作先行词时，只用关系代词that指代
B，the most beautiful cities that.I’d like to visit ，
当先行词被最高级修饰时，只能用关系代词that指代，故D是错的
As （） announced in today’s papers ，the shanghai EXPORT COMMODITIES FAIR isalso open on Sundays
A． being B.is C.to be D.been
选B as 替代后面整个句子As is announced...据。。。报道
They lost their way ， （ ）delayed them considerably。
A. as B.which C.for D.that
选B 整个句子做先行词，从句谓语为非be动词，做主语只能用which
This is the hour （ ）the place is always full of women and children。
A. that B.when C.where D.how
选B 先行词是表示时间。在从句中作状语。
The man once had a large sum of money ；now all （ ）is left to him is loneliness。
A. what B.which C.the thing Dthat
选D 先行词是all等不定代词常用that
.I have never been to Rome， but that’s one of the most beautiful cities
A.where I’d like to visit B.I’d like to visit C.I’d like to visit it D.which I’d like to visit
选B 先行词是cities 在从句中作visit的宾语。用which.也可省略。所以此题也可选D
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