单项选择题

When was the firm foundation of quantum theory laid

A．In 1913.
B．In 1924.
C．In 1925.
D．In 1927.
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In my country, the ______ are all distributed free.
A．letters box
B．letters boxes
C．letter’s box
D．letter boxes
单项选择题
He ______ have been nervous because he didn’t go straight in.
A．ought to
B．must
C．should
D．had to
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