优质解答
自从
since
或ever since
since [sins]
conj.因为；由于；既然；自…以来；自…以后
prep.自…以来；自…以后
adv.后来
例句:He hasn't been home since last year.
自从去年至今他未回过家.
Since the new management system was put into effect,the production of this factory has increased tremendously.
自从实行新的管理制度以来,这个厂的生产有了很大发展.
自从
since
或ever since
since [sins]
conj.因为；由于；既然；自…以来；自…以后
prep.自…以来；自…以后
adv.后来
例句:He hasn't been home since last year.
自从去年至今他未回过家.
Since the new management system was put into effect,the production of this factory has increased tremendously.
自从实行新的管理制度以来,这个厂的生产有了很大发展.