正常卵巢的大小为()
A.6cm×4cm×3cm
B.5cm×4cm×3cm
C.4cm×3cm×2cm
D.4cm×3cm×2cm
E.4cm×3cm×1cm
参考答案:E
— Did Tom return your book?
— Yes, but he _____ it for ten days before he returned it. [ ]
A. had kept
B. has kept
C. had borrowed
D. has borrowed
哪些工程必须进行抗震设防?