根据一句(包括从句)有且只有一个谓动的原则,其它地方如无谓语动词,则需要谓语动词;反之则不需要谓语动词。
Nowadays, weather experts are able to forecast when an El Nino will 55 , but.
(will后面必然是原形动词,一起构成谓语)
55. O strike
Scientists 54 this to be the longest El Nino for 2,000 years.
(此句后只有一个to be,是非谓语动词,故空格必为谓语动词;且空格前后均为名词性,也基本确定它是动词。)
54. A estimate
一个完整的句子之后再跟逗号,后面一般是非谓语动词短语。
The rainfall is increased across South America, 50 floods to Peru.
(前面是一个完整的句子,逗号后跟的,一般是非谓语动词短语。此题选项中非谓语动词只有一个,故直选之。)
50. L bringing
2)其它词的判断
形容词或名词修饰名词,限定词(the, this, that, a, my之类)后必有名词
This strange 47 happens every five to eight years.
47. F phenomenon
The hot, humid (潮湿的) air over the ocean causes severe 49 thunderstorms.
49. E tropical
El Nino usually lasts for about 18 months. The 1981-83 El Nino brought the most 52 weather in modern history.
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