Tom as well as two of his classmates _____invited to the party.

A．was

B．were

C．have been

D．had been

证券投资基金通过发行基金收益凭证聚集资金，形成集合财产，降低交易成本，从而获得收益的好处，体现了证券投资基金（）的特点。

A.分散投资

B.专业化管理

C.规模经营

D.费用低