It is still a question______who will be responsible for this matter.A．at handB．at lastC．at

The question is still ______ discussion.A．inB．byC．forD．under

However fast or slow the combustion rate, it is still a ______ between carbon, hydrogen, s

______it is long after dark, he is still wearing black sunglasses.A．IfB．AlthoughC．UnlessD．

It is considerate of you to turn down the radio______your sister is still ill in bed.A．whi

It is still illegal for a doctor to________.A.hel

Although it is raining hard _____A.Tom still wants to go outB.and Tom still wants to go ou