Scientists (have developed) an “organ-on-a-c

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M: +3.00/-0.00

Improve the bracketed part of the sentence.

Scientists (have developed) an “organ-on-a-chip” platform to study how drugs are transported across the human placental barrier.

[SSC CGL Tier-2 21-February-2018 English]

A have develop

B has developed

C is develop

D No improvement