A.why; because | B.when; why | C.how; when | D.why; why |
A.why | B.how | C.because | D.whether |
A.It; whether | B.There is ; that | C.It is ; that | D.There is; whether |
A.that | B.which | C.what | D.It |
A.because | B.what | C.why | D.which |
A.That | B.What | C.Which | D.Whether |
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