【C5】A．whenB．forC．butD．that

【C5】A．whenB．whichC．howD．it

【C5】A．asB．forC．withD．by

【C4】A．whenB．althoughC．butD．while

【C5】A．aboutB．forC．toD．as

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

【C17】A．soB．forC．butD．and