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
該題考查現在完成進行時和現在完成時。題意為我今天早上一直在寫信，到目前為止已經寫了4個小時。