Millions of people watched that first moon landing on television, their hearts in their mouths, aware of how difficult and dangerous an adventure it was, and what risks had to be ____. 
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A
taken
B
take
C
to take
D
taking
推荐题目
The boy is always found______in reading books.
#94164
A
to bury
B
burying
C
buried
D
buries
-- What’s the matter with you? ---____ the window, my finger was cut unexpectedly.
#92499
A
Cleaning
B
To clean
C
While cleaning
D
While I was cleaning
He missed  _______ when he was in Africa.
#90833
A
killing
B
to be killed
C
to kill
D
being killed
---I’d like to buy a new computer.---Well, we have several models __________.
#96276
A
to choose from
B
to choose
C
for choosing
D
for choice