问题
选择题
The astronauts know ______ control the direction and the speed of the spaceship. [ ]
A. how can they
B. what's to
C. how to
D. what can they
答案
答案：C
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The astronauts know ______ control the direction and the speed of the spaceship. [ ]
A. how can they
B. what's to
C. how to
D. what can they
答案：C