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【題目】 __________ the students found the soldier’s idea interesting, the system for the blind was too difficult to be of practical use.

A. As B. Since

C. While D. When

【答案】C

【解析】考查連詞。學(xué)生們發(fā)現(xiàn)士兵的想法很有趣，但對于盲人來說這個體系卻太難以付諸實施。

A. 當(dāng)…時候，因為。B既然，由于，自從。C.然而，卻，當(dāng)…… 時候；D當(dāng)…..時候。

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