Having checked the doors were closed,and_______all the lights were off,the boy opened the door to his bedroom.

A.why                                                             B.that

C.when                                                           D.where

B


解析:

that引導(dǎo)賓語從句,在從句中只起連接作用,不作任何成分,常被省略,但當(dāng)謂語后接兩個或兩個以上賓語從句時,第一個that可以省略,第二個that不能省略。故選B項(xiàng)。why引導(dǎo)賓語從句意為“為什么”。when引導(dǎo)賓語從句，意為“當(dāng)……的時候”。where引導(dǎo)賓語從句意為“在……地方”。

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More perhaps than any other European nation, the Swiss have got used to looking after foreign travelers. As early as the 18th century, wealthy French, Germans and Italians were treating the country as an amusement center while, in the 19th century, it became the major holiday playground for the British nobles. Today, it attracts visitors from all over the world.

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10．     Stomach pain.
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