1.Since calculators were introduced,they____ to be useful to
1.Since calculators were introduced,they____ to be useful tools for people wea
A.have proved B proved C will proved D are proving
2.She hasn't had any trouble since she ___ here
A.is to live B living C had living D lived
A.have proved B proved C will proved D are proving
2.She hasn't had any trouble since she ___ here
A.is to live B living C had living D lived
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