①Now we can record music using computers中的using为什么不用其原形，用using是属于固定搭配还是语意所决定

②He has recovered,──of his friends
A.to their much delight
B.to the much delight
C.to much their delight
D.much to their delight

③.I can't say which wine is best,It's a (n)
＿＿of personal taste.
A.affair
B.event
C.matter
D.variety

①Now we can record music using computers中的using为什么不用其原形，用using是属于固定搭配还是语意所决定

using在这里是非谓语动词，你看，简单句中只能有一个谓语，在本句中为复合谓语can record，所以就不能重复使用谓语use了。而use和we之间是主动关系，所以用现在分词using来表示，using computers作为record的宾语补足语，对它进行补充说明。如果和主语间是被动关系，那么就要用过去分词了，比如
Seen from the top of the mountain, our city is so beautiful.从山顶上看，我们的城市美极了。
这里的主语是our city和see之间是被动关系，所以用过去分词。


②He has recovered,──of his friends
A.to their much delight
B.to the much delight
C.to much their delight
D.much to their delight
这是一道高考题，首先要知道to one's delight是令人感到高兴的，这句话的意思是他恢复了，使得他的朋友们十分高兴，much,greatly等词用来修饰to one's delight/surprise等时，应该放在短语的前面，所以应该选择D。

③.I can't say which wine is best,It's a (n)
＿＿of personal taste.
A.affair
B.event
C.matter
D.variety
a matter of sth.关于。。。的问题。所以选择C，我不能说哪种酒最好，这是个人品味的问题。