討論串[文法] 幾題文法題
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bioluminescence和逗號後面是同位語. 意思是：生物化學用螢火蟲來研究生物體之發光，特定動植物散發出的無熱光芒。. (直接照翻)逗號後面整句是解釋"生物體發光". bioluminescence=the heatless light (which is) given off by cer
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1. Biochemists use fireflies to study bioluminescence, ________ .. A. the heatless light given off by certain plants and animals.. B. of which is give
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(B) have left. have + p.p. 現在完成式. will have + p.p. 未來完成式. by the time... 到了（那時候）. 等到你到了月台，火車恐怕已經走了。. (D) be left 是被動式，be + p.p.. 火車是主動離開，此外be left意思是「
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(1) I am afraid the train will ____ by the time you get to the platform.. (A)leaving. (B)have left. (C)left. (D)be left. 正解是B，請問一下D為什麼不行呢？. 另外這題是用文法上的
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1. A: I'm sorry you can't stay for dessert.. B: I'm sorry,too. But I really _____.. (A)must to go (B)must be gone (c)am having to go (D)have to be goi
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