单项选择题
Only after the students have mastered the rules of pronunciation （）.
A.can they memorize words more easily B.when can they memorize words more easily C.then they can memorize words more easily D.when they can memorize words more easily
单项选择题 Whynot（）toProfessorSmithforadvice？Heisanexpertinthisfield.
单项选择题 Wehadapartylastmonth，anditwasalotoffun，solet’shave（）onethismonth.
单项选择题 Numerousstudieshaveshownthat（）theteacher’sexpectation，thegreatertheachievementofthestudent.
