They won't let him out of the hospital ________ he's completely recovered.
A．since　B．until
C．ifD．a(chǎn)s
B
考查狀語從句中的連詞。句意：直到他完全恢復(fù)他們才允許他出院。這里考查固定句型“not...until”，意思是“直到……才”。
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