back before nine o’clock.

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back before nine o’clock.
---Mum,I’m outing.
---Well,and ____ you play or go shopping,you must come back before
nine o’clock.
A.whenever B.whether C.whichever D.no matter
为什么不能选D

whether…… + 祈使句,固定结构,“不管……,一定要……”
再问：为什么不能选D
再答：可以，但是也要交whether，如： No matter whether it is light or dark at that hour, we've decided to leave at five o'clock in the morning. 不管到时候是否天亮，我们都已决定早晨5点离开。

back before nine o’clock. I DON`T EXPECT THAT HE`LL COME BACK BEFORE NINE O`CLOCK,A.DO He ___ ___ there before nine o' clock. By nine o’clock, my father came back home at nine o'clock last night.对at nine would you mind 【】back before five o'clock? Are you s____ to come back before 9 o'clock? –– ________ I come back before 6 o’clock? --- _______ I come back before 6 o’clock? nine o' clock 的意思 It is nine o clock . School s____at nine o'clock.