Scientists thousands of chemicals before they decided on the right one in the end .
| A．tried out |
| B．found out |
| C．worked out |
| D．turned out |
相关试题
It is a rule in our school that no books______out unless you have a library card.
| A．must be taken | B．might take | C．can be taken | D．should be taken |
Naturally I will come to you for advice whenever I feel I need________.
| A．them | B．one | C．some | D．few |
Today，_____rapid transportation and communication, the whole word seems to be smaller．
A．regardless of B．in 
spite of C．instead of D because of
—What do you think of their new house?
—It’s very modern，but they have some antique________ in it．
A．furniture B．furnitures
C．piece of furnitures D piece of furniture
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