My friend asked me how much the T-shirt was

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be worth +钱数,意思是值多少钱.
要是用cost的话,前面不应该有was,可以说:my friend asked me how much the t-shirt cost but I forgot
======以下答案可供参考======
供参考答案1:
后面有个but啊
供参考答案2:
cost前不能加be动词，只能是“物”+cost
供参考答案3:
worth [简明英汉词典]
[wE:W]
prep.相当...价值
n.价值, 财产
adj.值钱的, 值的看中的
cost [简明英汉词典]
[kCst]
n.成本, 价钱, 代价
vt.价值为, (使)花费(金钱,时间,劳力等), 使失去(生命,健康等), 令人付出
vi.花费关注一下我，也想知道
供参考答案4:
cost前面就不用加be动词了
一般用作 sth. cost(s) 金钱/时间
be worth 值多少钱
be worthy 值得的
供参考答案5:
有个was 不用COST，
因为用cost 的话，直接用
My friend asked me how much the T-shirt cost,but I forgot.就好了。
而Be worth +sth/money 是一个词组，表示值多少钱~~
供参考答案6:
My friend asked me how much the T-shirt was____but I forgot.
A worth B worthy C cost D needed
咱们可以把这个句子改成陈述句来看，选A的话是The T-shirt was worth+价格
而选C的话就是The T-shirt was cost+价格，而根据cost的用法，应该是sth cost some money，加了was 就不对了所以是A供参考答案7:A1. worth： be worth + n. 当名词为金钱时，表示…… 值得…… be worth doing sth. ……某事值得被做 The question is not worth discussing again and again. 2. worthy：be worthy of +n. 当名词为抽象名词时表示……值得…… be worthy to be done 某事值得被做 The question is not worthy to be discussed againand again3.cost的主语是物或某种活动， 还可以表示“值”， 常见用法如下：(1)sth. costs (sb.) ＋金钱,某物花了（某人）多少钱。例：A new puter costs a lot of money. 买一台新电脑要花一大笔钱。(2) (doing) sth. costs (sb.) ＋时间,某物（做某事）花了（某人）多少时间。例：Remembering these new words cost him a lot of time. 他花了大量时间才记住了这些单词。