A.While | B.When | C.Since | D.Because |
A.when | B.until | C.unless | D.while |
A.When | B.However | C.Although | D.Unless |
A.why ; why | B.why; because | C.why ; that | D.that; because |
A.after | B.as | C.before | D.until |
A.whether | B.but | C.if | D.and |
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