409.Excuse me.I ____I was blocking your way.
A.don't realize
B.don't realize
C.haven't realized
D.wasn't realizing
410.The palace caught fire three times in the last century, and little of the original building ______ now.
A.remains
B.is remained
C.is remaining
D.has been remained
409.答案是A；结合语境，后文暗示过去时，指刚才没有意识到。
410.答案是A；remain vi.剩下，留下，不可使用被动语态。
