单项选择题

It was when he began to make the new experiment in 1908 ______ such an ambitious plan.

A．had he
B．did he have
C．that did he have
D．that he had
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单项选择题
Massive changes in all of the world's deeply ______ sporting habits are underway.
A．cherished
B．assumed
C．expected
D．supposed
单项选择题
There has been a ______ increase of complaint about the matter because of misunderstanding.
A．regretting
B．regretted
C．regretful
D．regrettable
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