why ( ) english? it's useful. A.not to learn B.not learning C.not learn D.don't learn

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• 完形填空：1.Many students in China are learning English.Some of these students are small c___.O___ are teenagers.Many are adults.Some learn at school,while others study by t___.A few learn English language over the radio,on t__,or in films.One must work hard to learn a n__ language.Why do all these peope want to learn English?lt is difficult to answer this q___.Many boys and girls learn English at school because it is one of their s___.They study their own
• why ( ) english? it's useful. A.not to learn B.not learning C.not learn D.don't learn
• why ( ) english? it's useful. A.not to learn B.not learning C.not learn D.don't learn
• 帮个忙,英语词组方面的.
• 4x=(x+6)×2 （x+4):x=8.4:1.7