测验年夜今日习题：
1.There has been a nation―wide shortage of building materials，（　　）which the trade is only just recove―ring．
A．for
B．on
C．at
D．from

2.The goods were packed（　　）gunny bags of 50 kgs net each．
A．on
B．in
C．with
D．of

3.Thank you for you（ 　）．
A．Cooperate
B．Cooperating
C．Cooperation
D．Cooperated

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