【C8】A．SinceB．AsC．IfD．Though

【B15】A．whenB．asC．ifD．though

【C12】A．SinceB．AsC．WhileD．What

【C5】A．SinceB．AsC．ThereforeD．Although

【C8】A．unlessB．sinceC．ifD．though

A．sinceB．asC．whenD．until

【C4】A．sinceB．asC．soD．thus