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Finally I can keep my words. :p
Hulstijin,J.H.&E.Marchena.Avoidance:Grammatical or semantical causes?[J].
Studies in Second Language Acquisition,1989(11):241-255.
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Laufer,B and Eliasson,S.What cause avoidance in L2 learning:L1-L2 difference, L1-L2 similarity,or L2...