I KNOW HELEN IS STUDYING BIOLOGY, BECAUSE I HAVE JUST SEEN HER IN...
32. I know Helen is studying biology, because I have just seen her in the laboratory.
A.
Helen may be a biology student because I know I have seen her studying in the laboratory.
D eT
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B.
I’m sure I saw Helen in the laboratory when she was studying biology.
C.
Because I saw her in the laboratory a little while ago, I know that Helen is a biology student.
D.
As I see Helen in the laboratory every day, I’m sure that the studies biology.