He has realized that he______his wallet in the shop. [ ]
A. left
B. forgot
C. borrowed
答案:A
生态系统中属于生产者的是 [ ]
A.仅限于绿色植物
B.仅限于自养生物
C.植物和动物
D.植物、细菌和真菌
—Look! What a modem hospital!
—Yes, it is. It_______ in 2007. [ ]
A. is built
B. was built
C. can be built
D. will be built