语法15-18As your instruction advised,you ought to spend your time on sth _____ researching into.A.valuable B.worthy C.worth D.worthwhile

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语法15-18
As your instruction advised,you ought to spend your time on sth _____ researching into.
A.valuable
B.worthy
C.worth
D.worthwhile

C.定语从句,省略关系代词和be动词,也就是.on sth (that is) _______researching into.其中是be worth doing是固定结构,其他be worthy to be done,be worthy of being done,it is worthwhile都不符合