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【单选题】
按其结构特点和开挖方式可分为手掘式、（ ）、半机械式、机械式等。A.
挤压式
B.
敞开式
C.
机掘式
D.
棚式
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反馈参考答案：
举一反三
【单选题】My wallet is nowhere to be found; ______ while I was on the bus.
A.
should I dropped it
B.
I must have dropped it
C.
I ought to have dropped it
D.
I had been dropping
【单选题】This is _____ English class. I hope you can enjoy English. [ ]
A.
our the first
B.
the our first
C.
our first
D.
first the our
【简答题】I like English class very much．English is my ______ class．
【简答题】根据开发河段的自然条件之不同，河川水能资源开发的基本方式包括 、引水式和混合式三种。
【简答题】水能的开发方式包括()、()和();
【单选题】I dropped my key in the garden, but luckily my mother ________it.
A.
located
B.
knew
C.
recognized
D.
spotted
【单选题】I by my teacher’s home when I was back home last night.
A.
dropped
B.
dropped on
C.
drop in
D.
dropped into
【单选题】In English class we must ___________ English. Please ___________ it ___________ English. [ ]
A.
speak, say, in
B.
talk, tell, with
C.
say, speak, in
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