b.united
c.connected d.combined
解析:选d。考查动词辨析。join参加;unite联合;connect联系,连接;combine结合。由题意知d项正确。
2.if he can __________ his ability with hard work,he should be very successful.
a.realize b.develop
c.combine d.train
解析:选c。考查动词辨析。句意:资源难易程度:★★★★★★★★★★★★★★★
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