问题
The scientists are now trying to discoverthat use could be _________ such material
A:The first coins in England were made of tin (踢)
B:But people used to use all kinds of things as money
C:No one knows for certain when people began to use money
D:a; /; /
B:But people used to use all kinds of things as money
C:No one knows for certain when people began to use money
D:a; /; /
正确答案是：
同类题型
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int is not who said the words, _____they are true or not
Is that girl under the tree Mary–No,it ________be Mary, she is in Beijing now.
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