gwd25-29

GWD25-Q29.

The army cutworm moth is a critical source of fat for many

of Yellowstone
                    National Park’s grizzly bears; they overturn

rocks to find them and consuming as many as 40,000 apiece

in a single day.

A.     bears; they overturn rocks to find them and consuming

as many as.

B.     bears; overturning rocks to find the insects, consum-

ing up to

C.     bears, overturning rocks to find them and they consume

as many as.

D.     bears, and they overturn rocks to find them and con-

sume up to

E.      bears, which overturn rocks to find the insects, consuming

as many as.ANS:e

mine d,why e??

我顶！

我问：

E中的", consuming ..."正确吗？

句末用逗号隔开的doing不是只有两种用法吗？

1.主语是整个主句；

2.主语是主句主语

E中的这个是哪种用法？