My parents and I ________ good at skating.
A.both are
B.are both
C.are all
D.all are
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C解析(both表示“两者都”,all指三者或三者以上“都”,My parents and I是三个人,应该用all.all和both充当主语同位语时,其位置应紧跟主语之后,实意动词前.如:The students all went home.又如:They both agreed to stay there.如果句中谓语是be动词,则放在be动词之后,如:They are both teachers.)