神马作文网he _____ research these three years,and he ___several discov
来源：学生作业帮 编辑：神马作文网作业帮 分类：英语作业 时间：2024/11/12 23:37:26
he _____ research these three years,and he ___several discoveries this year.
a.has been doing ,made b.has been doing ,has made.
能否说明原因？
a.has been doing ,made b.has been doing ,has made.
能否说明原因？
A,这三年来他一直做研究,这一年有了几个发现
再问： 今年不是也可以用完成时吗
再答： 如果后面有for this year, 可考虑B, 因为只是陈述今年的成绩，可直接用过去时
再问： this year 的前面能用for 吗
再答： for 在this year 前面有点牵强，但是一般完成时，时间长度前面有for 的居多。我的直觉告诉我选A, 因为B两个现在完成时感觉有点中式英语，过于强调语法的感觉。而且前面的and he 明显显示出不同的时态， 若都用完成时，可直接说, he has been doing research these three year and has made several discoveries this year.
再问： 今年不是也可以用完成时吗
再答： 如果后面有for this year, 可考虑B, 因为只是陈述今年的成绩，可直接用过去时
再问： this year 的前面能用for 吗
再答： for 在this year 前面有点牵强，但是一般完成时，时间长度前面有for 的居多。我的直觉告诉我选A, 因为B两个现在完成时感觉有点中式英语，过于强调语法的感觉。而且前面的and he 明显显示出不同的时态， 若都用完成时，可直接说, he has been doing research these three year and has made several discoveries this year.
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