sat 語法題求助,
1.Despite research( on the diagnosis of) heart disease and the use of (increasingly) sophisticated technology (in its treatment),the condition of coronary arteries (is) still difficult to assess precisely.可是我覺得its 指代不清啊,之前有diagnosis,disease,use.如果把句子變簡潔的話,就應該是its 指代diagnosis,可是根據(jù)句意應該指代disease啊,難道修剪句子的方法不靈了,its到底怎么判斷啊!
2.06年5月的真題
（Having millions of gallons of freshwater ) underground ,Florida environmentalists work to educate the public on the dangers of ground pollution.
A.
B.Because millions of gallons of freshwater are
覺得A 用動詞ing放句首表示原因沒錯啊,況且A比B短,答案為什么就選B