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1.___is often the case with children,Tom was completey bette

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1.___is often the case with children,Tom was completey better by the time the doctor arrived.
A.it B.as C.What D.Which
2.Is necessary that he _____.
A.gives up trying
B.give up tring
C.would give up
D.is going to give up trying
选什么?为什么这样选?
1.B
as is often the case
意思:通常就是这样
as引导定语从句,指代后边的整句Tom was completey better by the time the doctor arrived.
as又作is often the case 主句的主语.
2.B
这个句子里面你是否忘记写了一个 "it"?
It is necessary that he _____.
It is necessary that sb should do sth 是虚拟语气
should可以省略