Question

Look at ________ window!There is ________ fly on it．

1. A.
   the; the
2. B.
   a; a
3. C.
   the; a
4. D.
   a; the

Answer 1

C
看那个窗户，听话者应该明白所指属于特指，用定冠词the；后面句子叙述的是客观存在属于泛指，用不定冠词A．