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No clinical studies —- in this child disease research so far.

A. Had completed
B. Will be completed
C. Have completed
D. Have been completed

I have eaten breakfast already.

A. Simple Present

B. Present Continuous

C. Present Perfect

D. Simple Future (with modals)

it’s easy to use

A. a cellphone

B. a cat

C. a sandwich

The smugglers ——————– arrested.

a) Have
b) Has
c) Were
d) Had