—Who is Jerry Cooper —______ I saw you shaking hands with him at the meeting.
A. Don't you meet him yet
B. Hadn't you met him yet
C. Didn't you meet him yet
D. Haven't you met him yet
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以下哪个间隙容易引起严重张口受限的间隙感染( )
A. 舌下间隙
B. 咬肌间隙
C. 颌下间隙
D. 眶下间隙
E. 颏下间隙
In order to talk to several people at the same time on the Internet,______.
A. you have to speak fast and fluently
B. you should speak with wit and humor
C. one should pay much attention to the use of exact words
D. you have to express your ideas in a brief way
I don't really work here; I ______until the new secretary arrives.
A. just help out
B. have just helped out
C. am just helping out
D. will just help out
To save time on the Internet,______.
A. some people leave their letters in the dustbin
B. some people never use "shift" in their writing
C. people seldom use capital letters and punctuation
D. many people leave the capital or punctuation
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