They multiplied and filled the oceans and seas with oxygen, _____ encouraged the later development of early shellfish and all sorts of fish.

A．thatB．whereC．whenD．which

D

解析試題分析：考查非限制性定語從句。本題是一個(gè)非限制性定語從句，which指代前面一句話的內(nèi)容，在定語從句中做主語。Where和when在句中做狀語，不能做主語。That不能引導(dǎo)非限制性定語從句。故D正確。
考點(diǎn)：考查非限制性定語從句
點(diǎn)評(píng)：非限定性定語從句起補(bǔ)充說明作用，缺少也不會(huì)影響全句的理解，在非限定性定語從句的前面往往有逗號(hào)隔開，如若將非限定性定語從句放在句子中間，起前后都需要用逗號(hào)隔開。需要注意 which引導(dǎo)的非限定性定語從句是用來說明前面整個(gè)句子的情況或主句的某一部分。 在非限定性定語從句中，關(guān)系詞不能用that。

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