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短语讲解：

1. The police have said that the gun fight erupted between two rival groups, since that they were criminals rather than protesters.

rather than …而不…，与其…倒不如…（要）
例句：User interfaces should be based on user mental models rather than implementation models.
用户界面应该基于用户的心理模型，而不能基于实现模型。

2. The seven-member anti-corruption committee is made up of academics and civil society activist who have a daunting task given the scale of the problem.

be made up of 由…组成
例句：Human tissue is made up of cells.
人体的组织是由细胞构成的。

3. They said they were also responsible for the death of a soldier in an attack against a military helicopter there.

be responsible for 为…负责，形成…的原因; 主管
例句：You'll be responsible for anything wrong.
出了事唯你是问。

4. The United States says it's deeply concerned about the brief detention of 90 dissidents in Cuba over the weekend.

concern about 使（自己）关心…
例句：She showed great concern about you.
她很为你担心。

5. It was until last year when her father died that she decided to find out more.

find out 查清，找到
例句：I'll find out the address,and ring you back.
我找到地址后再与你通电话。