Those are _________.
A．their boxB． their boxesC．they boxesD．they box
B

試題分析：句意：這些是……，結(jié)合語(yǔ)境可知本句表語(yǔ)用復(fù)數(shù)名詞，前文用形容詞性物主代詞做定語(yǔ)，故選B。
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