GWD31-Q11

     Cash flows to stock and bond mutual funds have gained strength in the last two months,  

     but fund managers have not been eager to invest the new money, instead of preferring to

     raise the cash levels in their portfolios at the highest level in six months.

A.       have not been eager to invest the new money, instead of preferring to raise the cash levels in their portfolios at

B.       have not been eager to invest the new money, instead preferring to raise the cash levels in their portfolios to

C.       have not been eager at investing the new money, instead of preferring to raise the cash levels in thief portfolios to

D.      were not eager to invest the new money, instead of preferring to raise the cash levels in their portfolios at

E.       were not eager at investing the new money, instead preferring to raise the cash levels in their portfolios to

A.     instead of表示而不是，其否定了后面的内容，表示fund managers没有eager to invest the new money，也没有去preferring to raise….逻辑错误；raise…to the highest level是习惯用法。Raise…at错了。

B.      正确。instead表示反而，侧重了后面的内容。Raise….to the highest level正确

C.      Eager at用法错误应该是eager to；instead of错误同A。

D.     Instead of用法错误同A。raise…at 错误同B。

E.      Eager at用法错误。

但我有一个疑问，如果E选项把at改成to，那么B和E的时态不同，该怎么选择呢？

还有很多题目到底是选择一般过去式，还是现在完成时，还是不太明白。