单项选择题

In Britain the ______ on a letter is now twelve pence.< br>

A. postage
B. posting
C. post
D. postal

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填空题
______(necessary) is the mother of invention.
单项选择题
I just can’t understand ______ at him. He is only eleven!
A. you to laugh
B. you laugh
C. you why laugh
D. your laughing
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