The pressure of this gas pipe is greater than .
A. the gas pipe
B. of the gas pipe
C. that of the gas pipe
D. those of the gas pipe
网友回答
A. the gas pipe
B. of the gas pipe
(答案→)C. that of the gas pipe
D. those of the gas pipe
解析：为了避免重复，连词as和than后面的比较状语从句虽然可以作某些省略，但比较成分不能省略，否则会引起误解。如这里比较的是pressure，所以后面要用that来代替这个名词。如果代替的是复数名词，则用those。