问题描述：
long do you think it will be______the computer company puts forward a new product?
How long do you think it will be______the computer company puts forward a new product?
A.before B.since C.until D.that
请问这道题的答案为什么是A而不是C呢?
How long do you think it will be______the computer company puts forward a new product?
A.before B.since C.until D.that
请问这道题的答案为什么是A而不是C呢?
问题解答：
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