They still go on working, ________ they feel tired.
A．forB．a(chǎn)lthoughC．becauseD．but
B

試題分析：句意：雖然他們累了，（但是）他們?nèi)匀粓猿止ぷ鳌８鶕?jù)句意，此句是讓步狀語從句，應填although.故選B。
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