Scientists ____ thousands of chemicals before they decided on the right one in the end.
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A
tried out
B
found out
C
worked out
D
turned out
推荐题目
The twins are so much alike that no one can ________one from the other.
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A
distinguish
B
separate
C
identify
D
recognize
At the meeting, Professor Lin __________some good advice and all the people present agreed with him.
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A
came up
B
came about
C
came up with
D
came out
Do you know why Nelson Mandela _________ violence to make black and white people equal?
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A
turn in
B
turn out
C
turn to
D
turn over
We were all agreed that the cottage would a perfect holiday home for the family.
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A
make
B
turn
C
take
D
have
A number of questions __________at the meeting held yesterday.
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A
came up
B
were come up
C
brought up
D
was brought up