1.Mr Hill is good _____making toys A.in B.on C.at 2.This pair of jeans ______Tom's A.are B.is C.be

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1.MrHillisgood_____makingtoysA.inB.onC.at2.Thispairofjeans______Tom''sA.areB.isC.be1.MrHillisgood____

1.Mr Hill is good _____making toys A.in B.on C.at 2.This pair of jeans ______Tom's A.are B.is C.be
1.Mr Hill is good _____making toys A.in B.on C.at 2.This pair of jeans ______Tom's A.are B.is C.be

1.Mr Hill is good _____making toys A.in B.on C.at 2.This pair of jeans ______Tom's A.are B.is C.be
选C和B.be good at doing是固定词组,是擅长的意思.一条牛仔裤是不可数的,所以用is.