问题
选择题
.
China is one of the countries in the world which_________astronauts to space so far.
A．have sent
B．has sent
C．sent
D．sending
答案
答案：A
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.
China is one of the countries in the world which_________astronauts to space so far.
A．have sent
B．has sent
C．sent
D．sending
答案：A