She only knew that she went there ( ),but forgot about the exact

She only knew that she went there ( ),but forgot about the exact

题目
She only knew that she went there ( ),but forgot about the exact
A.Sunday
B.on Sunday
C.on a Sunday
D.in a Sunday
答案
C
她只记得她是某个星期天去的那里,但忘了确切的日期了.
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