The boy has been knocking atknocking at the door for some time. (knocking into /knocking at)
【考點(diǎn)】現(xiàn)在完成進(jìn)行時(shí);動(dòng)詞短語(yǔ).
【答案】knocking at
【解答】
【點(diǎn)評(píng)】
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發(fā)布:2024/10/4 15:0:6組卷:2引用:2難度:0.6
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