问题: Successfullanguagelearnersderiveconclusions_____________.
A: todiscoversentencepatternsandgrammaticalrules
B:toexpandvocabulary
C:tousethetargetlanguage
D:toencourageunsuccessfullanguagelearnerstolearnindependently,activelyandpurposely
E:fromclues
F:tosaystrangethings
