When the farmers dug the well, they _____ a large collection of ancient china. [ ]

The _____ of electricity added to our difficulty repairing the bridge.

_ we call the First Aid Centre, thedoctors _______ by and by

gs have become an inescapable part of the reputation of universities, ________them to attract students, staff and research investment.

下列各句中，没有语病、句意明确的一项是