___________ your own bags when shopping is very necessary.A.Take B.Taking C.Takes D.Took不明白为什么不选B,动名词作主语不可以吗?为是么要用祈使句?

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___________ your own bags when shopping is very necessary.A.Take B.Taking C.Takes D.Took不明白为什么不选B,动名词作主语不可以吗?为是么要用祈使句?

___________ your own bags when shopping is very necessary.A.Take B.Taking C.Takes D.Took不明白为什么不选B,动名词作主语不可以吗?为是么要用祈使句?
___________ your own bags when shopping is very necessary.
A.Take B.Taking C.Takes D.Took
不明白为什么不选B,动名词作主语不可以吗?为是么要用祈使句?

___________ your own bags when shopping is very necessary.A.Take B.Taking C.Takes D.Took不明白为什么不选B,动名词作主语不可以吗?为是么要用祈使句?
因为用了taking句子没谓语,就没主句了,when引导的是状语从句

有具体语境的吧?
动名词作主语只是客观陈述这个事实
祈使句就有命令的语气在里面了~