【C4】A．whenB．althoughC．butD．while

【C4】A．andB．asC．butD．even

【C4】A．AndB．EvenC．ButD．So

Hardly had we got on the bus______it began to rain.A．whenB．sinceC．butD．before

【C4】A．orB．soC．butD．and

【C5】A．whenB．forC．butD．that

【C4】A．ThenB．OrC．ButD．So