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hi;
Please,you can answer the following question.
In the fırst half of the 20th century many scıentısts .... liquid crystal as chemical impurities with no scientific or practical merit
a)put down
b)wrote off
c)let go of
d)left out
1. In the fırst half of the 20th century many scıentısts [wrote off] liquid crystal as XXX chemical impurities with no scientific or practical merit.
I'd agree that B is the best answer. But the question seems a little odd to me. Something seems to be missing, where I've put "XXX".
Perhaps:
2. In the fırst half of the 20th century many scıentısts wrote off liquid crystals as substances full of chemical impurities with no scientific or practical merit.
phrasel verb 
Linear Mode
