单选题：_______he will offer us enough help doesn't matter a lot to..

Getting rid of bad habit is________forming a good one.[ ]A. an effort much asB. much an effort asC. as an effort much asD. as much an effort as

As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season.[ ]A.beforeB.unlessC.sinceD.until

If we work hard, we can overcome any difficulty, ________ difficulty it is.[ ]A. whatB. howC. whateverD. however

Winning the bid to host the Olympic Games means not only a great honor to a nation ________.[ ]A. but a great responsibility B. but as well as a great responsibilityC. as well as a great responsibilityD. but a great responsibility as well

________the new belling sounds gentle and formal, it will be some time before we can adapt to it.[ ]A. Since B. Although C. When D. In case