What we need are some engineers. 我们需要的是一些工程师。
What we need is an English interpreter. 我们需要一位英语翻译。
6. The number of people invited _______ fifty, but a number of them _________ absent for different reasons.
A. were, was B. was, was
C. was, were D. were, were
答：C。 the number of 接名词做主语时，谓语用单数。a number of 接名词做主语时，谓语用复数形式。
