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【简答题】
机构是由若干构件以 相连接,并具有 的组合体。
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举一反三
【单选题】I ____ a precious book in a used book store. It became an important source of reference for my paper.
A.
stumbled upon
B.
stumble upon
C.
stumbled over
D.
stumble into
【单选题】Look! This is my new room, and that’s ______.
A.
John and his brother’s
B.
John's and his brother’s
C.
John and his brother
D.
John's and his
【单选题】Look! This is my new room, and that’s ______.
A.
John and his brother’s
B.
John's and his brother’s
C.
John and his brother
D.
John's and his
【单选题】My new profile photo got 56 _______. That’s more than I expected!
A.
likes
B.
trolls
C.
memes
D.
trends
【单选题】The cottage will be cold.Make sure ___ the heater.
A.
you light
B.
lighting
C.
you’ll light
D.
for lighting
【单选题】I ____ a precious book in a used book store. It became an important source of reference for my paper.
A.
Stumble into
B.
Stumbled over
C.
Stumbled upon
D.
Stumble upon
【单选题】—Henry, ________ the light is ________ when you leave the lab. —All right. [ ]
A.
be sure; turned on
B.
make sure; turned off
C.
sure; turning off
D.
make sure; turning off
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