问题描述：
no sooner...than...可否用于现在完成时?
就比如：I have no sooner reached home than it begins to rain?可以这样用吗,还是说只能是主句过去完成时,从句一般过去时?
就比如：I have no sooner reached home than it begins to rain?可以这样用吗,还是说只能是主句过去完成时,从句一般过去时?
问题解答：
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