----Why  do  you   look  so tired ?
----_______I  am writing a report for the newspaper.
A．WhenB． BecauseC．UntilD．Although
B

試題分析：根據(jù)題干，本句的意思是：---為什么你看上去這么累？---因為我正為報社寫一篇報道。本句是解釋累的原因。故用because。所以本題選B。
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