______ we cann"t know the exact number of students who will go to the park this weekend.
问题描述：
______ we cann"t know the exact number of students who will go to the park this weekend.
A.In a moment
B.For a moment
C.On the moment
D.At the moment
答
In a moment 立刻
For a moment 一会儿,片刻
On the moment 立刻
At the moment 此刻
选D,现在我们还不知道这周末要去公园的学生的具体人数