another ten days 谓语用单数形式还是复数形式?

问题描述:

another ten days 谓语用单数形式还是复数形式?
-Do you need more time to finish the work?
-Yes,another ten days____enough.
A are
B is
C were
D was

B
因为在这里another ten days被看作一个整体,所以用单数.