Buddy is a drug-detector dog, working for the police. What it can do is beyond your expectations. For instance, Buddy can tell ______ there are illegal drugs in a bag. (A) what (B) how (C) that (D) if
(D) if
It seems that the scent of a person on the scarecrow's clothes is actually______ frightens the birds off. (A) what (B) which (C) that (D) where
(A) what
Another requirement was _________ he should have larger ears, up-slanting (傾向) eyes and eyebrows. (A) what (B) whether (C) why (D) that
(D) that
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