In recent years,operations __ (become) much safer than they __(be) in the past.用括号内单词正确时态填空,

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Inrecentyears,operations__(become)muchsaferthanthey__(be)inthepast.用括号内单词正确时态填空,Inrecentyears,operat

In recent years,operations __ (become) much safer than they __(be) in the past.用括号内单词正确时态填空,
In recent years,operations __ (become) much safer than they __(be) in the past.
用括号内单词正确时态填空,

In recent years,operations __ (become) much safer than they __(be) in the past.用括号内单词正确时态填空,
have became was