4.Lucy is the one of the students who _________ to China.Let's welcome her.( )
A. | has been | B. | have been | C. | has gone | D. | have gone |
11._______is known to us is that tobacco contains nicotine and other harmful products,so you should give up smoking.( )
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A. | As | B. | It | C. | What | D. | Which |