How long do you think it will be ________ the computer company puts forward a new product?
A．beforeB．sinceC．untilD．that
A
考查連詞。It is/will + 時間段 + before….在……之后……才，句意：你覺得這家電腦公司多長時間能推出一個款產(chǎn)品？
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