单项选择题
A.can we learn B.we can learn C.we learn can D.that we can learn
Only then（）how much damage had been caused.A.she realiz...
单项选择题Only then（）how much damage had been caused.
A.she realized B.she had realized C.had she realized D.did she realize
They are the principles, many of them, （）I learned at m...
单项选择题They are the principles, many of them, （）I learned at my mother’s knee.
A.which B.that C.what D.how
The question is not worth（）again and again.A.discussB.d...
单项选择题The question is not worth（）again and again.
A.discuss B.discussing C.to discuss D.to be discussing
