They have built the second building ____. I am sure ...

★ Grammar - Present Perfect with already, just, yet

They have built the second building ____. I am sure they will complete the whole center before the time they promised.

A. ago

B. yet

C. already

D. just

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The architect has _____ started the project. Tell the boss he has to wait for at least three weeks to see the first draft plans.

A. ever

B. yet

C. just

D. already