-Be careful! You might fall into the water.
-Thank you. I____.I______ so close to the pool.
A．didn't know; am standing
B．don't know; am standing
C．didn’t know; was standing
D．didn't know;Would stand
C
根據(jù)下文內(nèi)容可知是之前沒注意，用過去時，根據(jù)上下文的內(nèi)容可知答案為C
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