单项选择题

"What is he" "He is ______."

A.a teacher and writer
B.a teacher and a writer
C.teacher and writer
D.the teacher and writer
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单项选择题
John is the only one of the staff members who ______ to be transferred.
A.are going
B.have been going
C.is going
D.has been going
单项选择题
The boiling water in the kettle decreases because it ______ into vapor. In other words, it is vaporizing or evaporating.
A.is being converted
B.is converted
C.has been converted
D.converts
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