Mary had to wait outside her house for her husband's return because she （）her key in the office.
A.正确答案Chas left
B.leaves
C.had left
D.left
Mary had to wait outside her house for her husband's return because she （）her key in the office.
Mary had to wait outside her house for her husband's return because she （）her key in the office.
A.正确答案Chas left
B.leaves
C.had left
D.left
