______ (现在一项专利通过大约需要3年左右的时间), and today’s backlog of 500,000 is expected to doub

游客2024-06-09 30

问题 ______ (现在一项专利通过大约需要3年左右的时间), and today’s backlog of 500,000 is expected to double by the end of the decade unless there are big changes.

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答案 It now takes around three years for a patent to be approved

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【S1】[br]【S9】by→before连词错误。by后面只能跟名词短语，不能跟时间状语从句，应改为beforethiscenturyisout(