亿级的数表示多少个亿.______.
根据整数的数位顺序表可知:
亿级包括的计数单位有:亿、十亿、百亿、千亿;表示多少个亿;
所以亿级的数表示多少个亿,是正确的.
故答案为:√.
They _______ on the program for almost one week before I joined them, and now we ________ it as no good results have come out so far.
A.had been working; are still working
B.had worked; were still working
C.have been working; have worked
D.have worked; are still working
老视