Up till now, full use of this theory has
题型:选择题
问题:
Up till now, full use of this theory has been ________ in building large ocean-going ships.
A.done
B.made
C.laid
D.taken
Up till now, full use of this theory has been ________ in building large ocean-going ships.
A.done
B.made
C.laid
D.taken