【題目】As we know, man’s understanding of nature is developing _______.

A. at the right time B. for the first time

C. from time to time D. all the time

【答案】D

【解析】

句意：正如我們所知，人類對(duì)自然界的理解一直在發(fā)展。at the right time在適當(dāng)?shù)臅r(shí)候，for the first time第一次；from time to time不時(shí)，有時(shí)；all the time一直。此處與現(xiàn)在進(jìn)行時(shí)連用，故表示一直發(fā)生的事，故用all the time。故選D。

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