单选题
Shipbuilders would not _____ their money unless they knew that they could make a profit.
A、
invest
B、
invent
C、
involve
D、
invite
【正确答案】
A
【答案解析】
a. invest 投资 b. invent 发明 d. involve 涉及到，卷入 d. invite 邀请
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