SAT語法題2道
1.The Pacific Northewest (averaging 4000 wildfires a year,caused mostly) by lighting.
A.原句
B.averages 4000 wildfires a year; most are caused
D.with an average of 4000 wildfires a year,caused mostly
PS：括號內(nèi)是A選項(xiàng)
問：為何原句和D選項(xiàng)是錯(cuò)的
2.An entire ant colony working together can solve problems,（such as when they find） the shortest path to a food source ,that are impossible for an individual ant to solve.
A.原句
B.such as finding of
C.such as finding
問：B選項(xiàng)為什么不對