单项选择题

In the Unites States, it is required that all children______ school, public or private, for 12 years

A．must attend
B．need attend
C．should attend
D．ought to attend
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单项选择题
At first, the ______of color pictures over a long distance seemed impossible, but, with painstaking efforts and at great expense, it became a reality.
A．transaction
B．transmission
C．transformation
D．transition
单项选择题
To plot Shakespeare's life is to become involved in a kind of detective story______ there are plenty of clues but very little else.
A．where
B．which
C．from which
D．when
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