the pen just()two yuan.A.spends B.costs C.pays D.takes

B
四个单词的用法
spend的主语必须是人,(1) spend time ／money on sth.在……上花费时间（金钱）.例：I spent two hours on this maths problem.这道数学题花了我两个小时.(2) spend time ／ money (in) doing sth.花费时间（金钱）做某事.例：They spent two years (in) building this bridge.造这座桥花了他们两年时间.
cost的主语是物或某种活动,还可以表示“值”,常见用法如下：sth.costs (sb.) ＋金钱,某物花了（某人）多少钱.例：A new computer costs a lot of money.买一台新电脑要花一大笔钱.
take后面常跟双宾语,常见用法有以下几种：(1) It takes sb.＋钱＋to do sth.做某事花了某人多少钱.例：It took them three million to build this road.他们用了三百万修完了这条路
pay的基本用法是：pay (sb.) money for sth.付钱（给某人）买…….例：I have to pay them 20 pounds for this room each month.我每个月要付20英磅的房租.

B

B
物作主语时用COST
注：A与C是人作主语，D用于句型：It takes sb some time to do sth

B
这题考查四个“花费”。
（1）主语是人时，用spend或pay。spend的句式是
sb. spend +时间或金钱+ on sth.
或sb. spend + 时间或金钱+ (in) doing sth.。
（2）pay的句式是sb. pay for sth.
（3）主语是物时，用cost。句式是sth. cost sb. + 时间或金...

cost的主语可以是物

spend 、pay的主语是人
take 的主语是it形式主语

B