题干
---Tom hurt his left leg in the game this morning.
---Really? It would take at least two weeks ______ he could recover and return to school.
---Really? It would take at least two weeks ______ he could recover and return to school.
A：whe
B：that
C：since
D：before
答案(点此获取答案解析）
D
，
，且
.
；②
；③
；④
；
；⑥
其中正确结论的序号是( )