第12题: [单项选择]—This ruler is three times as long as that one. It is not______ to discuss the question again and again. A. worth B. worthy C. worthwhile D. worth while 参考答案:C 答案解析:[解析] worth,worthy和worthwhile均为形容词,意为“值得的”,但三者用法不同:worth后跟名词或动名词;而worthy常与of连用,构成be worthy of,of的后面接名