20.Only after numerous failed attempts to stabilize the patient’s vital signs ___________ the doctors consider an experimental treatment.
(A) had
(B) did
(C) was
(D) have

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統計： A(2), B(7), C(1), D(2), E(0) #3427178

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#6380994
繁體中文解析： 正確答案是 (B) d...
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