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The pen I____ I _____is on my desk, right under my nose.
A.think; lost
B.thought; had lost
C.think; had lost
D.thought; have lost
将听筒置于胸壁上即可听见中等响亮杂音,在心脏收缩期杂音强度的分级上为第几级()
A.Ⅱ
B.Ⅲ
C.Ⅳ
D.Ⅴ
E.Ⅵ