Question

---Tom says he is too tired to go on.
---He can’t be.He ______for an hour.

1. A.
   just worked
2. B.
   has only been working
3. C.
   has just worked
4. D.
   had only been working

Answer 1

B
考查動(dòng)詞的時(shí)態(tài)。從本題的語(yǔ)境中可以看出他不可能累的原因是：他從開(kāi)始工作到現(xiàn)在僅僅才工作了一個(gè)小時(shí)，因此應(yīng)該用現(xiàn)在完成進(jìn)行時(shí)。