问题
Some people believe that English is one of the most important subjects for us students.–It _______ . But things seem to be changing in recent years.
A:used to
B:used to be
C:used to do
D:was used to be
B:used to be
C:used to do
D:was used to be
正确答案是：
同类题型
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Listen! Helen is singing in the next room. -It ___ be Helen. She has gone to Beijing.
7N9 is a deadly virus, it is still safe to eatthoroughly-cooked chicken.