2010崇文英语二模the whole process for the studies of cancer took more than a year,the technology is moving so fast that it will soon take just weeks．\x05A．How \x05B．Because \x05C．If \x05D．While为什么选d While后部是不是必须

2010崇文英语二模the whole process for the studies of cancer took more than a year,the technology is moving so fast that it will soon take just weeks．\x05A．How \x05B．Because \x05C．If \x05D．While为什么选d While后部是不是必须
2010崇文英语二模
the whole process for the studies of cancer took more than a year,the technology is moving so fast that it will soon take just weeks．
\x05A．How \x05B．Because \x05C．If \x05D．While
为什么选d While后部是不是必须加进行时吗

2010崇文英语二模the whole process for the studies of cancer took more than a year,the technology is moving so fast that it will soon take just weeks．\x05A．How \x05B．Because \x05C．If \x05D．While为什么选d While后部是不是必须
while有两个意思,一个表示同时发生了另外一件事,要用进行时,这里事然而的意思,楼上说的不错^^