请选择BA8?.[5h)p5o5[:{1{1p)c1C8|These ducks __________ very naughty.+U+^5J,]'\.\2H/A8n0x7p
A. is+U+^5J,]'\.\2H/A8n0x7p
B. are+U+^5J,]'\.\2H/A8n0x7p