A.It exists | B.T here has existed |
C.There exists | D.It has existed |
A.there | B.which | C.where | D.because |
A.if | B.whether | C.which | D.that |
A.whether ; doing ; so | B.that ; dealing ; so |
C.whether ; dealing ; such | D.that ; doing ; such |
A.what ; no matter whom | B.that; whoever |
C.which; whomever | D.that ; no matter who |
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