GWD语法

melody远行

Q7:GWD32-Q10

The soft drink company’s flat earnings for the second quarter reflect the success of both its restructured global bottling system and the extent to which poor currency exchange rates keep down profits for multinationalcompanies




A.reflect both the success of its restructured global bottling system and the extent of poor currency exchange rates keeping

B.reflect both the success of its restructured global bottling system and the extent to which poor currency exchange rates are keeping

C.reflect both the success of its restructured global system and the extent of poor currency exchange rates keeping

D.both reflect the success of its restructured global bottling system and to what extant poor currency exchange rates are keeping

E.
both reflect the success of its restructured global bottling system and to what extent poor currency exchange rages are keeping
这题为什么选B呢？C哪儿错了？另外B选项倒数第二个单词are是不是和主语单复数不一致呢？

litaiyang

extent of 后面只能加名词或者名词词组