问题描述：
since和for的题目,
I have been studying at NESE_________ january.
My head hurts!I have had a headache_______________four hours.
Jake hasn't worked__________last summer.
He has been unemployed___________seven months.
I am so hungry!I haven't eaten anything_______yesterday morning!
We haven't eaten anything__________a day!
They have been playing tennis _____________9：00 am.
I have been studying at NESE_________ january.
My head hurts!I have had a headache_______________four hours.
Jake hasn't worked__________last summer.
He has been unemployed___________seven months.
I am so hungry!I haven't eaten anything_______yesterday morning!
We haven't eaten anything__________a day!
They have been playing tennis _____________9：00 am.
问题解答：
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