1.At present parents have a lot ----- A.to worry C.to worry about

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1.At present parents have a lot ----- A.to worry C.to worry about

1.At present parents have a lot ----- A.to worry C.to worry about
1.At present parents have a lot ----- A.to worry C.to worry about

1.At present parents have a lot ----- A.to worry C.to worry about
c.因为这里to表示目的状语,而worry是不及物动词,所以要加about
不懂可再问哦

C

C

C

A

正确:C