17.
(A) requires
(B) required
(C) requiring
(D) to require

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統計： A(21), B(119), C(58), D(29), E(0) #1617012

詳解 (共 2 筆)

#2324169
首先你要先知道的單字：consist o...
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#2945208

Enzymes consist of various types of proteins (that work to drive the chemical reactions)( 17 for certain types of nutrients to take effect.)

(that work to drive the chemical reactions)修飾protein

( 17 for certain types of nutrients to take effect.)修飾chemical reactions

所以原本句子為....chemical reactions which are required for certain types of nutrients to take effect→此種化學反應是某些營養素作用的必要條件
省略which 改成being required再省略being

所以答案是 required 

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私人筆記 (共 1 筆)

私人筆記#6628793
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答案：(B) required 需要的...
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