I had just stepped out of the bathroom and was busily drying myself with a towel ______ I heard the steps.
A．whileB．whenC．sinceD．a(chǎn)fter
B

試題分析：考查連詞：句意：我剛剛走出浴室正在用毛巾擦干自己，這時(shí)我聽見腳步聲。這里是在聽到腳步聲的那一刻，表示時(shí)間點(diǎn)，用when. While通常是表示時(shí)間段的，after通常是表示在…….之后。Since后跟時(shí)間點(diǎn)時(shí)，一般跟現(xiàn)在完成時(shí)連用。選B。
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