Pertanyaan
The Amazone valley is extremely important to the ecology of the earth. Forty percent of the world's oxygen _____ there.
A. are being produced
B. are produced
C. is being produced
D. is produced
E. was produced
Jawaban
Alasan:
1. Pertama, kita perlu melihat kalimat yang disediakan dan mengidentifikasi tenses yang digunakan. Kalimat "The Amazon valley is extremely important to the ecology of the earth" menggunakan Simple Present Tense.
2. Berdasarkan tenses dari kalimat pertama, kita dapat menyimpulkan bahwa kalimat kedua juga harus menggunakan Simple Present Tense. Selanjutnya, kita harus memutuskan apakah kalimat tersebut harus dalam bentuk aktif atau pasif. Dalam kalimat ini, lembah Amazon bukanlah yang memproduksi oksigen, tetapi oksigen diproduksi di sana. Oleh karena itu, kita harus menggunakan bentuk pasif.
3. Rumus untuk Simple Present Tense dalam bentuk pasif adalah [S + am/is/are + Verb 3]. Dalam kalimat ini, subjeknya adalah "Forty percent of the world's oxygen", yang merupakan subjek tunggal. Oleh karena itu, kita harus menggunakan "is" sebagai kata kerja bantu.
4. Kata kerja yang diperlukan dalam bentuk ketiganya adalah "produced". Jadi, jika kita menggabungkan semuanya, kita mendapatkan kalimat yang benar: "Forty percent of the world's oxygen is produced there".
Dengan demikian, jawaban yang benar adalah "D. is produced".
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