1.The modern mocroscope is no longer the mocroscope ____it w
1个回答

1.D what (it was before)它以前的样子

2.B that 引导定语从句

A in which=where C as表示原因

3.C by then

A by that time到那次为止 B by which time 到哪一次C by then到那时 D by the time到...时(通常用过去时)

4.B all that

all that = what与前半句what you have given me对应

5.C as

A which(如果原题是这样可选More middle_aged persons suffer from heart trobule ,___is generally believed.) B that(它在此起不了主语的作用) C as (就如...)

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