Someone knocked at the door       he was doing his homework.

A．a(chǎn)fterB．whenC．untilD．a(chǎn)s soon as

B

解析試題分析：句意：有人敲門，他正在做作業(yè)。After在……之后；when當(dāng)……的時(shí)候； until直到； as soon as一……就。結(jié)合前后句子意思可知該選B。
考點(diǎn)：考查連詞。

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