A.half as good asB.as half good as

C.as good as halfD.good as half as

【答案】A

【解析】

考查倍数表达法。句意：这家餐馆不及我们去的那家餐馆的一半好。本题的解题关键是倍数应放在as的前面，也就是倍数表达法的句型：A + be + 倍数 + as + 形容词原级 + as + B。故A正确。