2.Is it advisable to leave the house while air ducts ______ by a hired crew?
(A) are being cleaned
(B) are clean
(C) are cleaned
(D) are cleaning
答案:登入後查看
統計: A(272), B(18), C(203), D(65), E(0) #1831843
統計: A(272), B(18), C(203), D(65), E(0) #1831843
詳解 (共 6 筆)
#3032845
請問為何要用被動進行式?
看題目感覺是描述一件事情,應該能用單純被動式嗎吧?(選C)
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#4404539
Is it advisable to leave the house while air ducts are being cleaned by a hired crew?
air ducts ,前面這主詞 是複數,所以用are
being,be不重要,重點在ing,表示: "進行"的暗示 ,當"進行"通氣管道清理時…
air ducts 清潔風道、通氣管道,是被清理,所以用cleaned
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