23乘21的积减去480,差是多少?
23×21-480=3
蛄床上,自然绝经的停经时间指()
A.连续3个月
B.连续6个月
C.连续12个月
D.连续1年半
E.连续2年
The reason was _____ I was busy with my work at that time.
A.why
B.because of
C.that
D.what