1.While shopping, people sometimes can’t help _____into buying something they don’t really need. persuade rsuading ing persuaded persuaded2.She looks forward every spring to ____ the flower-lined garden. sit ying a visitC.walk inD.walking in3._____is worth doing at all is worth doing well.A.ThatB.WhichC.WhateverD.If4._____ the sad news, she burst out _____.A.On, cryingB.At, cryingC.At, teatsD.On, tears5.______president for so long, it was an unpleasant thought that he would have to take a back seat.A.After beingB.BeingC.To have beenD.Not being请告之相关知识点，谢谢！
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n't help doing不能克制做某事，此处表示被说服,故选C2。look forward to doing,此处to为介词,故选D。C项应在最后加to,pay a visit to去参观,拜访3。此处少主语,故选 l that=what 如果题目中没有at all,那么填All that也说得通。这里是泛指,任何值得做的,都值得做好。4。burst out doing突然…起来 burst out crying=burst into tears at表示一…就…，at+名词词组=on+名词（动名词）5。此处根据时间关系,可填after being\having been,因为当总统的事已经发生,所以不能选C。由于题目中有so,作副词修饰long,根据语意不能选D。选B,则时态没有A正确。 take a back seat黯然引退, 处于次要地位。