unlike a hurricane ,which can be observed from within ,a tornado is so small that such a study has not been pactical
b, that studying it that way has not been impractical
c for such srudies as this to have been impractical
d,as to not make such a study practical
e,as to be impractical of study
我选的E,答案是A,大家帮忙讲解一下
和so...as to ...在这题里应该是一样吧
是时态的原因吧。
至今为止not pracitcal,应该用现在完成时。
而且e选项的介词of比较奇怪。用to比较对吧。
so...that...如此,以致于(接结果)
so..as to... ?我好象没见过这样是一个"结构"呢
搬个凳子,听别人的解释
是时态的原因吧。
至今为止not pracitcal,应该用现在完成时。
而且e选项的介词of比较奇怪。用to比较对吧。
同意
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