问题
选择题
6. Measures have been taken to prevent accidents, but much ______ for more improvement.
A．remains to be done
B．is remained to do
C．remains to do
D．is remained to be done
答案
A
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6. Measures have been taken to prevent accidents, but much ______ for more improvement.
A．remains to be done
B．is remained to do
C．remains to do
D．is remained to be done
A