The rise of oil prices made scientists search for new energy resources ______ oil.
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A
replace
B
replacing
C
to replace
D
replaced
推荐题目
Linda had her luggage________ an hour before her plane left.
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A
check
B
checking
C
to check
D
checked
We didn’t expect them ___ for us when we arrived there so late.
#97334
A
to be waiting
B
to have been waiting
C
to have waited
D
to wait
 ______ into many languages, the book is popular in many countries.  
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A
Being translated
B
Having translated
C
To be translated
D
Having been translated