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问题 选择题

________ the course very difficult，she decided to move to a lower level.(2013·北京，24)

A．Find

B．Finding

C．To find

D．Found

答案

答案：B

考查非谓语动词作状语。句意为：发现这门课程很难，她决定转向难度更低的课程。本句主语she与find之间为主谓关系，故用现在分词作状语。

选择题

Due to the policy of free highway fees on major holidays, too many passenger cars are trapped on the highways, causing heavy traffic jams, some even _______ for several hours.

A．held up

B．broken up

C．taken up

D．given up
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单项选择题 B型题

巴比妥类（）。

A.华法令

B.保泰松

C.双香豆素

D.氢化可的松

E.苯妥英钠下列药酶诱导剂可以使以上哪些药物效力降低
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