Mrs. Smith locked both the front and the back doors before she went to bed（ ）that someone might steal into the house at night.
A.正确答案Bso
B.for fear
C.unless
D.on condition
Mrs. Smith locked both the front and the back doors before she went to bed（ ）that someone might steal into the house at night.
Mrs. Smith locked both the front and the back doors before she went to bed（ ）that someone might steal into the house at night.
A.正确答案Bso
B.for fear
C.unless
D.on condition
