单项选择题

A．Between April and December.
B．In April.
C．In December.
D．He isn’t certain.
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单项选择题
A．Because David liked animal.B．Because it was David’s birthday.C．Because she liked pets.D．Because David had asked her for one.
A．Because David liked animal.
B．Because it was David’s birthday.
C．Because she liked pets.
D．Because David had asked her for one.
填空题
It was during the period when Einstein was studying for his doctorate that he began his______.
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