问题描述：
1.We must listen and speak as much as possible _______ our English.
A.improve B.to improve C.improving D.improves
2.The foreign teacher ______ Nanjing for more than three years.
A,came to B,has arrived in C,has been in D,has come to
3.Today's trains travel ______ about 240 kilometres an hour.
A.on B.at C.in D.of
A.improve B.to improve C.improving D.improves
2.The foreign teacher ______ Nanjing for more than three years.
A,came to B,has arrived in C,has been in D,has come to
3.Today's trains travel ______ about 240 kilometres an hour.
A.on B.at C.in D.of
问题解答：
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