【題目】The infrastructure of a country is ________ makes everything run well, including things like transport, irrigation, electricity and schools.

A. which B. that

C. where D. what

【答案】D

【解析】考查表語從句。句意：一個國家的基礎(chǔ)設(shè)施就是使一切運轉(zhuǎn)正常的東西，包括運輸、灌溉、電力和學(xué)校等。此處有實際意義表示“什么”，在表語從句中作主語用what引導(dǎo)，故選D。

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