单选题 As its______grew, funds began to accumulate and the union got more and more powerful.

A、 recruit
B、 size
C、 membership
D、 expansion

【正确答案】 C

【答案解析】解析：membership n.会员数；全体会员(如：The membership of the club is now 500．The society has a large membership．)。recruit n．新兵，新成员。size n.大小，尺寸，尺码。expansion n．扩大，扩充；扩张，膨胀。