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【单选题】
He spent thirty minutes in finishing his homework.A.
It took him half an hour to finish his homework.
B.
It takes him half an hour to finish his homework.
C.
It cost him half an hour to finish his homework.
D.
He spend half an hour to on finishing his homework.
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举一反三
【单选题】When we meet some new words, we’d better in a dictionary.
A.
look them up
B.
look them out
C.
look out them
D.
look up them
【单选题】When we meet some new words, we'd better ______ in a dictionary. [ ]
A.
look out them
B.
look them out
C.
look them up
D.
look up them
【简答题】传感器作为长期测量或反复使用的器件其()特别重要