—     useful invention it is.
—Yes, It helps us a lot.

A．What anB．What aC．HowD．How a

B

解析試題分析：感嘆句主要有what和how構(gòu)成：
1、what修飾名詞或名詞短語(yǔ)，有以下兩種形式： 1. What+a(an)+（形容詞）+單數(shù)可數(shù)名詞+主語(yǔ)+謂語(yǔ)！或是：What+名詞詞組+主語(yǔ)+謂語(yǔ)！ 2. What+(形容詞）+可數(shù)名詞復(fù)數(shù)或不可數(shù)名詞+主語(yǔ)+謂語(yǔ)！
2、How引導(dǎo)的感嘆句。 how用來(lái)修飾形容詞、副詞或動(dòng)詞。其結(jié)構(gòu)是：How+形容詞（副詞）+主語(yǔ)+謂語(yǔ)！
根據(jù)下文useful invention it is，可知invention是可數(shù)名詞單數(shù)，useful詞首音素是輔音，不定冠詞用a，故選B。
考點(diǎn)：感嘆句
點(diǎn)評(píng)：當(dāng)how修飾動(dòng)詞時(shí)，動(dòng)詞不跟著感嘆詞提到主語(yǔ)之前。 what與how引導(dǎo)的感嘆句，一般情況下可以相互轉(zhuǎn)換，轉(zhuǎn)換后意義不變。在口語(yǔ)中，感嘆句的主語(yǔ)和謂語(yǔ)常常省略。

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