问题
选择题
Two manned spacecraft _____ into space in China in the past few years.[ ]
A. was sent
B. has been sent
C. are sent
D. have been sent
答案
答案：D
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Two manned spacecraft _____ into space in China in the past few years.[ ]
A. was sent
B. has been sent
C. are sent
D. have been sent
答案：D