選擇B in
in和after 區(qū)別
in +時(shí)間段：與將來(lái)時(shí)連用
after +時(shí)間段：與過(guò)去時(shí)連用
after +時(shí)間點(diǎn)：可與將來(lái)時(shí)連用
He will be back in two hours.
He came back after two hours.
in+一段時(shí)間表示將來(lái)時(shí)
如:I'll come back in a week
in＋一段時(shí)間也可用于過(guò)去時(shí),意思是”．．．內(nèi)”
如:he came in two days.
而after＋一段時(shí)間通常只能用于過(guò)去時(shí),不能用于將來(lái)時(shí)
如：he came back after a weekafter +時(shí)間點(diǎn)：可與將來(lái)時(shí)連用 可以給我一個(gè)例句嗎？He will be back after two o'clock.兩點(diǎn)鐘之后他將回來(lái)。