摘要：His health is . A.as poor ,if not poorer than,his sister’s B.as poor as,if not poorer than,his sister’s C.poor as his sister’s ,if not poor D.as poor,if not poorer than his sister
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His health is ________.
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A．as poor as, if not poorer than, his sister's
B．as poor, if not poorer than, his sister
C．poor as his sister's if not poor
D．as poor, if not poorer than his sister's
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