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题型：单选题题类：真题难易度：普通

Like ancient sailors, birds can find their way____ the sun and the stars.

A、used B、having used C、using D、use

举一反三

When {#blank#}1{#/blank#}(compare) with the size of the whole earth, the highest mountain doesn't seem high at all.

Biogas is produced by r{#blank#}1{#/blank#} plants and animal waste.

After {#blank#}1{#/blank#}(graduate) from college, we finally got the chance to take a bike trip.

_________, the student insisted that he should be separated from his roommates, who were noisy.

He wastes so much of his valuable time c{#blank#}1{#/blank#} on the Internet.

_____ the deaf children, the young lady has little time to care for her own daughter.

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