问题
Good to see you again. It’s almost threeyears _______ we met last time.—Yes, how time flies.
A:until
B:before
C:while
D:since
B:before
C:while
D:since
正确答案是：
同类题型
time of HINI, scientists ____ their spare timeto conduct research on the ways of curing the disease
Shall I open the window to let some fresh air in —No，________ .
Dad, why should I stop ______ computer games— For your health, my boy, I’m afraid you ______.
Which boy do you want to see now ——-The _______ in the redhat