1.The Internet has__profound effect on people's daily life,but I think it's only __most important invention in history.
A.a,a B.a,the C.the,the D.the,a
(本题选A)
2.Housing prices __sharply in the past six months,and I doubt whether I can afford a buy if things go on like this.
A.are rising B.have risen(本题选B,我选的A,为什么不能理解为持续的增长?)
3.David didn't take part in the World Cup held in South Africa __he had his foot injured in a match.
A.unless B.even if C.because D.as long as
(本题选C.为什么不选D?D也有因为得意思啊.)