The doctors said it would be months _____ Yao Ming was fit enough for regular training.
A．thatB．whenC．sinceD．before
D
考查連詞.句意:醫(yī)生說在姚明足夠適合參加定期訓(xùn)練之前會(huì)有幾個(gè)月的時(shí)間.故選D.在……之前。
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