题目内容

The teacher told us to write ________ letter.


  1. A.
    a 400-word
  2. B.
    a 400-words
  3. C.
    an 400-word
  4. D.
    an 400-words
A
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My mother is a teache in ________ university．

[　　]
A．

a

B．

an

C．

the

D．

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