Madame Curie is believed _______ radium.
#96123
A
discovering
B
having discovered
C
to have discovered
D
to discover
推荐题目
With our country entering an aging society, ______ the retirement age is probably unavoidable.
#88616
A
having delayed
B
delaying
C
being delayed
D
to be delayed
A terrible earthquake struck this country, _______ thousands of peopledead and more missing．
#93972
A
caused
B
causing
C
having caused
D
to cause
Nancy, ________ for about half a year to apply for a job as an airline hostess, finally took a position at a shopping center.
#95238
A
struggled
B
having struggled
C
struggling
D
to struggle
Apple has given in to intense pressure from Chinese state media about its customer service practices, ________ to consumers in its second-largest market.
#91841
A
apologizing
B
apologize
C
having apologized
D
to apologize