于自己在做的事情(造就了他的巨大成功)。”that在此引导的是主语从句，且在从句中不作成分。
7．The argument doesn't hold much ground ________ family backgrounds offer graduates an advantage in the career competition nowadays.
A．where C．which
B．that D．when
解析：选B 句意：现在大学毕业生的家庭背景会在职业竞争中为他们提供优势这一观点是没有多大根据的。that引导同位语从句，解释说明argument的内容。
8．The infrastructure of a country is ________ makes everything run well, including things like transport, irrigation, electricity and schools.
A．which C．where
B．that D．what
解析：选D 句意：一个国家的基础设施指的是，让交通、灌溉、电力以及学校等所有方面能顺利运行的物质条件。空处引导表语从句，且从句中缺少主语，所以应用连接代词what来引导。
9．You can use this room for your club activities tomorrow ________ you keep it tidy and clean.
A．for fear that C．on condition that
B．in case D．even if
解析：选C 句意：你可将这个房间用于明天的俱乐部活动，条件是你要保持房间整洁干净。根据句意可知，空格处用on condition that引导条件状语从句。
10．The majority of new businesses fail because, ________ they have a product or service that fills a gap in the market, they usually lack the skills in sales, marketing, and administration.
A．now that C．as long as
B．even if D．as though
解析：选B 句意：大多数新企业都倒闭了，因为即使它们有填补市场空白的产品或服务，但它们通常却缺乏销售、营销和管理方面的技能。根据句意可知应用even if在句中引导让步状语从句。
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