7.Someoneis knocking (knock) at the door.Go and see who it is.

分析 有人正在敲門.去看看是誰.

解答 答案:is knocking.
根據(jù)Go and see who it is,可知去看看是誰.從這里可以判斷前面說的是有人正在敲門,所以這里句子使用現(xiàn)在進(jìn)行時(shí),構(gòu)成:am/is/are+Ving.Someone為不定代詞是單數(shù),故填is knocking.

點(diǎn)評 本題考查用所給單詞的適當(dāng)形式填空,首先要根據(jù)語境明確句意,然后再根據(jù)相關(guān)語法對所給單詞在形式上做出正確的變化.

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