The _ told him that Rheumatoid arthritis was a ________and osteoarthritis was not.
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單項選擇題
Participants were excluded （） they had rheumatoid arthritis, joint tuberculosis, or alergic arthritis.
Participants were excluded （） they had rheumatoid arthritis, joint tuberculosis, or alergic arthritis.
A.once
B.if
C.unless
D.despite