问题

Be careful. You might fall into the river.—Thank you. I ________ I ________ so close to it.
A:didn’t know; am standing
B: don’t know; am standing
C:didn’t know; was standing
D:didn’t know; would standing
B: don’t know; am standing
C:didn’t know; was standing
D:didn’t know; would standing
正确答案是: