The store was broken into last night.It was a long time____the own discovered what had

问题描述:

The store was broken into last night.It was a long time____the own discovered what had
happened.
A.before
B.until
C.since
D.when

The store was broken into last night.It was a long time__D__the own discovered what had
happened.
A.before
B.until
C.since
D.when
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