Question

这个语法题怎么做啊 啊啊啊啊啊

21.Below the bend, the river, flowing more swiftly, as it cuts through sand hills covered with pine trees.
 A. river, flowing more swiftly, as it cuts
 B. river, flowing more swiftly, cutting
 C. river flows more swiftly and it is cutting 
 D. river flows more swiftly as it cuts
 E. river flows more swiftly, it cuts

Answer 1

选择D选项。因为这个题里as引导从句。表示前后的平行。其他选项动词没有。