单项选择题

He operates the new computer as if he ______ special training in it.

A. has received
B. had received
C. would received
D. received
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单项选择题
A. A student and his classmate. B. A teacher and his student. C. A librarian and a student.
A. A student and his classmate.
B. A teacher and his student.
C. A librarian and a student.
单项选择题
Who should be monitoring the wild birds and preparing to tackle disease outbreaks
A. Health officials in Asia.
B. Health officials in Europe.
C. Health officials in America.
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