Evenifthereisnoscientificproof

Even if there is no scientific proof secondhand smoke causes cancer, there is no reason why nonsmokers should be forced to take this risk.

A．which

B．that

C．when

D．where

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A．arrested

B．affected

C．attacked

D．attended

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A．live

B．had lived

C．have lived

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A．might

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A．to read

B．having read

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A．which

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