1.应该用did，如果用have的话，应是known而不是know。这是倒装句，将助动词提前而已，可以句子还原为they
have
a
good
knowledge
of
English
but
they
known
little
about
German.2.问人口的句型固定句型为“what
is
the
population
of
……
？”那么就排除了B，D你认为“population是不可数名词，谓语动词用单数。”是错的。英文上没有复数，但实质上是可数名词，谓语用复数3.这题是过去分词作后置定语。这个句子的主语是The
Town
Hall
，谓语是was，相当于一个定语从句“The
Town
Hall
which
was
completed
in
the
1800's
was
the
most
distinguished
building
at
that
time
.”你没有弄清知识点过去分词作后置定语。你尽快把他弄懂吧！谢谢，希望您的英语有所提高！
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