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【单选题】
Have you ever met with this case in your life________you can't understand others even if they have said something several times? [ ]A.
where
B.
what
C.
that
D.
which
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【简答题】按注塑模具浇注系统基本结构的不同可分为____、____和____。
【单选题】Usually, trade fairs can only be attended by _____ and members of the press.
A.
company representatives
B.
B. the public
C.
C. customers
D.
D. everyone
【单选题】Usually, trade fairs can only be attended by _____ and members of the press.
A.
company representatives
B.
the public
C.
customers
D.
everyone
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