多想选择的第6个，选择a答案为什么不行啊

第7个，a和c为什么不行啊

6

, it immediately ran away. (lines 8-9)

a. Observing herb. On being observedc. Having been observedd.On her being observed

与原句中的when意思要一致，when引导的时间状语从句表示一

结构形式和as soon as 相一致的

如果用主动： On observing her, it immediately ran away.

On seeing me, he waved to me.

B

7Pumas never attack a human being except

cornered.(lines 9)

a. they areb. beingc. that they ared. when they are

原句中unles----if…not / except on the condition that

when=if

except可以和名词/名词性从句进行搭配，也可以是when / if 引导的从句形式。

D

你不能把题目发到这上面来么？

[1_29]对啊，把题目写到上面来！大家可以看到

！