and so + 句子没问题。B错在 用成了 allow 应该是 allows,嘿嘿,小细节忽略了吧~~
我也选E。allow sb to do sth . allow that 是错的啊,没这个用法啊。
-- by 会员 jameshzd (2011/6/6 22:25:06)
Unlike frogs that metamorphose from tadpoles into adults within a one-year period,
it takes three to four years for the mountain yellow-legged frog of the Sierra Nevada to reach adulthood, and so they are restricted to deeper bodies of water that do not dry up in summer or freeze solid in winter.
正确的选项是(E) mountain yellow-legged frogs of the Sierra Nevada take three to four years to reach adulthood, and so they are
-- by 会员 anny22781 (2011/6/7 9:33:38)