A.if | B.while | C.though | D.before |
A.can; when | B.would; because | C.may; if | D.must; when |
A.or | B.and | C.but | D.while |
A.that; that | B.where; that |
C.where; which | D.that; which |
A.though | B.when | C.after | D.unless |
A.We didn’t know | B.He doesn’t know |
C.There is no knowing | D.It was known that |
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