单项选择题

Lacking further hard evidence of the bombing itself, the police could hardly tell who might be responsible.（）

A．由于警方难以确定此爆炸事件的负责人，所以进一步的取证工作很难进行。
B．因为对爆炸事件的进一步取证工作很难进行，警方难以确定谁来作负责人。
C．由于对爆炸事件本身缺少进一步的确凿证据，警方无法确定谁有可能是主谋。
D．因为对爆炸事件的进一步取证工作很难进行，警方无法确定谁有可能是主谋。

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