【题目】It is hard for the Greek government to get over the present difficulties_________ gets more financial support from the European Union.
A.if
B.unless
C.because
D.since

【答案】B
【解析】句意：除非有来自欧洲联盟的更多的经济支持，否则希腊政府很难克服目前的困难。只能选择unless“除非”才能使句意完整。故选B。