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He could do nothing but wait for the bus to come

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He could do nothing but wait for the bus to come
he could do nothing but ( )for the bus( )
a.wait;to come
b.wait;come
c.waiting;coming
d.waited;came
想知道为什么选择A
He could do nothing but wait for the bus to come
1、but(except,besides) 等词前面的句中有实意动词 do 时,该不定式结构中的 to 要省略,否则一般不省略.例如:区别以下两个句子I have nothing to do but (wait )for him.
和I have no choice but (to accept )the fact.第一个句子因为but前面有实意动词do,所以不再加to,而第二个句子but前面的句子没有实意动词do,则需要加to.也可以记住这两个经典句型哈.
2、第二空只能选非谓语动词的形式,因为一个句子只能有一个谓语动词.并且-ing形式一般表示正在进行,to do表将来,还没发生.
再问: 谢谢回答 ,还想问一下 How kind you are!You always do what you can ____me. A help B helping C to help D helps 选什么?为什么?
再答: 选c哈,因为是省略句哈,完整句子为 You always do what you can do to help me