【C12】A．SinceB．AsC．WhileD．What

【C12】A．sinceB．in whereC．whereD．which

【C5】A．SinceB．AsC．ThereforeD．Although

【C8】A．SinceB．AsC．IfD．Though

【C2】A．WhenB．AsC．WhileD．Since

A．sinceB．asC．whenD．until

【C4】A．sinceB．asC．soD．thus