A few years ago, scientists in the Antarctic became aware of ________ in the ozone layer.[ ]

A. holes growing

B. holes to grow

C. holes' being grown

D. holes to be grown

对于提供劳务，若资产负债表日不能对交易的结果作出可靠地估计，已经发生的劳务成本预计能够得到补偿的，应以实际发生的成本作为当期的支出，以能够获取的补偿作当期收入，两者一定是相等的。( )