反复应用药物后,人体对药物的敏感性降低,称为:
A.习惯性B.过敏性C.成瘾性D.耐受性E.依赖性
参考答案:D
It’s already 11 o’clock and nobody answers the phone. George ________ asleep now.
A.must be
B.must have been
C.should be
D.should have been
在Word中,要实现将文字以两端对齐等距分散来排列,应使用()