Question:
Who ________ at the door?
-
A.
knock -
B.
is knocking -
C.
have been knocked -
D.
have knocked
Reference explanation:
Correct Answer: GET
Key: is knocking
Because: according to the usage of the present continuous, it describes an unusual event that is happening at the time of speaking
Translation: Who is knocking on the door?
The answer is NO
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