A.Who | B.Whom | C.Those who | D.Whoever |
A.if | B.weather | C.if or not | D.whether |
A.which | B.why | C.that | D.how |
A.When | B.After | C.While | D.As |
A.that | B.there | C.which | D.what |
A.what , what | B.what, that | C.where, whether | D.where, what |
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