This higher water content also makes 23 easier for them to bruise.
答案：(D) it
make 後面的受詞位置放虛受詞 it，代替後面真正的受詞 for them to bruise，形成 make it + 形容詞 + for sb + to V 的句型；such、much、that 都無法擔任這個虛受詞。
虛主詞你很熟——It is easy for me to answer this question. 但「虛受詞」大概沒學過。本句 makes ___ easier for them to bruise 的真正受詞是後面那一長串 for them to bruise，因為太長，先用 it 占住受詞的位置。
makes 後面要有受詞，而這一句真正的受詞是 for them to bruise。英文語法習慣為盡快表達出句意重點，真受詞太長時就用 it 代替受詞，也就是虛受詞，真正的受詞移到後面。兩個句型並排看最清楚：It is easier for them to bruise.（虛主詞）；This makes it easier for them to bruise.（虛受詞）。虛主詞課本教過，虛受詞比較少見，但道理相同。make、find、think、consider 後面都能這樣用：I find it hard to believe.（我覺得難以相信）、We think it necessary to act now.（我們認為現在有必要行動）。
make it + 形容詞 + for sb + to V（使某人做某事變得…）、find it hard to V（覺得難以…）、think it necessary to V（認為有必要…）。
Onions can be divided into two categories: fresh onions and storage onions. Fresh onions are available 21 yellow, red and white throughout their season, March through August. They can be 22 by their thin, light-colored skin. Because they have a higher water content, they are typically sweeter and milder tasting than storage onions. This higher water content also makes 23 easier for them to bruise. With its delicate taste, the fresh onion is an ideal choice for salads and other lightly-cooked dishes.
Storage onions, on the other hand, are available August through April. 24 fresh onions, they have multiple layers of thick, dark, papery skin. They also have an 25 flavor and a higher percentage of solids. For these reasons, storage onions are the best choice for spicy dishes that require longer cooking times or more flavor.