The earliest English was written in a kind of English that is now difficult .A. poem; to

问题补充：

The earliest English was written in a kind of English that is now difficult .

A. poem; to understand

B. poet; to be understood

C. poetry; to be understand

D. poetry; to understand

答案：

A. poem; to understand

B. poet; to be understood

C. poetry; to be understand

(答案→)D. poetry; to understand

解析：词义辨析和不定式用法。第一空指诗歌，可以使用poem或者poetry表示诗歌。当形容词是difficult,或者easy的时候，后面使用不定式的主动形式。故D正确。