you can stay in my room_____you promise not to use the computer.

you can stay in my room_____you promise not to use the computer.

题目
you can stay in my room_____you promise not to use the computer.
A.so far as B.except C.unless D.provided
答案
答案是 D.如果你能答应不用我的电脑,我就可以让你呆在我家里.
provided 是连词,也可可以说provided that.意思是“如果……的话”“只要”又如:
They may swim provided an adult accdompanies them.
She may come with us provided (that) she arrives in time.
不可以选C,如果选C,则前面应为否定句,意思才成立,因为unless是“如果不”等于if not.如果选unless,前面则要用否定式,You can't stay in my room__unless___you promise not to use the computer.如果你不答应不使用我的电脑,我就不让你呆在我的家里.这样意思才能讲得通.
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