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【多选题】
三种基本逻辑运算是指（ ）。A.
与逻辑
B.
或逻辑
C.
非逻辑
D.
与非逻辑
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【单选题】This book by a famous writer many years ago. [ ]
A.
writes
B.
is written
C.
written
D.
was written
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【单选题】Kate ______ the letter before her mother came into her bedroom. [ ]
A.
has written
B.
was written
C.
had written
D.
is writing
【单选题】—Can you tell me whom the play ____ in 1998? —Sorry, I don't know. [ ]
A.
was written by
B.
was written
C.
is written by
D.
is written
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