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Is     necessary to complete the design before National Day?
A．thisB．thatC．itD．he
C
在英語(yǔ)中，為了保持句子平衡，避免頭重腳輕。常將較長(zhǎng)的主語(yǔ)放在句尾（常由不定式或連接詞引導(dǎo)的從句構(gòu)成），而將先行詞it置于句首充當(dāng)邏輯主語(yǔ)（或稱(chēng)形式主語(yǔ)）。本句便屬這種類(lèi)型，故正確答案為C。意思是“有必要在國(guó)慶節(jié)前完成這項(xiàng)設(shè)計(jì)嗎？”
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