【題目】—Can I go swimming with John, Mom?

—Of course. But you________be back by six.

A.canB.mustC.couldD.may

【答案】B

【解析】

句意：—媽媽，我可以和約翰一起去游泳嗎？—當(dāng)然。但是你必須在六點(diǎn)之前回來(lái)。

考查情態(tài)動(dòng)詞。can可以，能；must必須；could可以，can的過(guò)去式；may可以。題干說(shuō)的是：你必須在六點(diǎn)之前回來(lái)。must必須，故選B。

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