问题
选择题
Samples of blood from Cholera infected patients have been sent to the blood center _______. [ ]
A. to be checked
B. to be examined
C. to test
D. being tested
答案
答案：B
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Samples of blood from Cholera infected patients have been sent to the blood center _______. [ ]
A. to be checked
B. to be examined
C. to test
D. being tested
答案：B