--- What ________ useful book !
---Yes, it is. But I found___________ difficult for me to read.


  1. A.
    an, it was　　
  2. B.
    a, it’s　　　
  3. C.
    an, it’s
  4. D.
    a, it
D
試題分析：英語(yǔ)中不定冠詞的用法是根據(jù)后續(xù)單詞的詞首音素，如果詞首音素時(shí)元音，則用an，否則用a。上文useful詞首音素為輔音，故不定冠詞用a。下文it做形式賓語(yǔ)指代后面內(nèi)容，故選D。
考點(diǎn)：冠詞及it用法
點(diǎn)評(píng)：英語(yǔ)中不定冠詞的用法是依據(jù)后續(xù)單詞的詞首音素，而不是詞首字母，這一點(diǎn)需要注意。It可知在文中做形式主語(yǔ)形式賓語(yǔ)，學(xué)習(xí)中注意在總結(jié)。
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