Question

I ________ letters this morning and ________ for four hours so far．

1. A.
   will write; wrote
2. B.
   have written; have written
3. C.
   was writing; wrote
4. D.
   have been writing; have written

Answer 1

D
该题考查现在完成进行时和现在完成时。题意为我今天早上一直在写信，到目前为止已经写了4个小时。