问题
Measures have been taken to prevent theaccidents, but much _____ for more improvement.
A:to be held
B:is remained to do
C:remains to do
D:is remaining to be done
B:is remained to do
C:remains to do
D:is remaining to be done
正确答案是：
同类题型
My plan is _________ the Summer Palace next weekend.
I don’t have any change with me. Will you pay thefare for me—_______.
The school often ______ many books and magazines for the teachers to refer to.
30. Even if you are an experienced teacher, you sometimes ____ make some mistakes.
She ___ volleyball regularly for many years when she was young