消弧线圈避雷器表面有破损、裂纹或污秽严重，开展（）类检修，必要时更换避雷器。
A.A
B.B
C.C
D.D
参考答案：C
He is ________ to buy _________ for his parents.
A．rich enough; enough present
B．enough rich; enough presents
C．rich enough; enough presents
D．enough rich; presents enough
A bridge _____________ in the distance and its construction _____________ in a year.
A．is being built; will be finished
B．is built; has been finished
C．has been built; is being finished
D．is being built; is finished
