3.妈妈经常被误认为是我姐姐,因为她看上去非常年轻.
My mother is usually mistaken for my sister,because she looks very young..
My mother is usually mistaken for my sister,because she looks very young..
19.-How long is it _____ you started the project of protecting the environment?( )
| A. | before | B. | since | C. | if | D. | because |
18.When you have used that book,don't forget to _________on the shelf.( )
| A. | put it out | B. | put it up | C. | put it through | D. | put it back |
17.-Each of the students working hard at their lessons _________the book.
-So have I.( )
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-So have I.( )
| A. | reads | B. | is reading | C. | have read | D. | has read |