单项选择题

The student asked her professor if he would have gone on the space ship he did know earlier（）.

A．if he knew
B．if he knows
C．he had known
D．had he known

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单项选择题

Most of the older civilizations which flourished during the fifth century B.C.are died out（）.

A．they have died out
B．has died out
C．have died out
D．they had died out

单项选择题

Depression that inflicts people who believe their lives lack content when the rush of the busy week stops referred to by a prominent psychiatrist as Sunday Neurosis（）.

A．has been referred to by a prominent psychiatrist
B．has been referred to as by a prominent psychiatrist
C．a prominent psychiatrist has referred to it
D．it has been referred to by a prominent psychiatrist