单项选择题

The Bunsen burner is so named because it is thought ______ by Robert Bunsen, who was German by birth.

A. having been invented
B. to be invented
C. to have been invented
D. being invented
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单项选择题
The explanation ______ him to our point of view.
A. changed
B. altered
C. converted
D. transferred
单项选择题
He ______ the 9:00 train because he didn't leave home until 9:10.
A. couldn't have caught
B. shouldn't have caught
C. ought to have caught
D. must not have caught
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