Unit5课时作业(二)
Ⅰ.用正确时态填空
1.Tom ________________________(write) his composition the whole morning. He is too tired.
[答案] has been writing
2.I ________________________(work) here since I graduated from my college.
[答案] have been working
3.He ________________________(cough)for a week. He should go to see a doctor.
[答案] has been coughing
4.The train ________(start) at ten o'clock in the morning.
[答案] starts