多发性硬化的临床表现有()
A.单侧或双侧视力下降
B.单肢或多肢无力
C.眼球震颤
D.共济失调
E.复视
参考答案：A, B, C, D, E
26. Google is testing a new television programming search service, _____ users to find shows videos from websites like Youtube.
A．having allowed
B．allowing
C．to allow
D．Allowed
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