【題目】Unless I finish all my homework, I _____________watch TV or go out with my friends.

A.canB.mustC.can'tD.mustn't

【答案】C

【解析】

句意：除非我完成所有的作業(yè)，否則我不能看電視或者和我的朋友出去。

考查情態(tài)動詞詞義辨析。can可以；能；must必須；can't不能；mustn't禁止。根據(jù)句意可知此處表示寫不完作業(yè)不能看電視，也不能出去玩，故選C。

情態(tài)動詞

用法

can

表示能力，意為“能；會”，可與be able to轉(zhuǎn)換。否定式 can't

表示請求、允許，意為“可以”

could

can的過去式，意為“能；會”，表示過去的能力

在疑問句中表示委婉的請求

couldn't

表示“不能；不會”

must

表示主觀看法，意為“必須；應(yīng)該”

否定式mustn't，表示“禁止；不允許”

have to

不得不，表示客觀原因。否定式 don't have to

should

意為“應(yīng)該”，表示要求和命令，也可以表示勸告或建議

may

表示請求、許可，意為“可以”，還可表示祝福和愿望

might

may的過去式

表示請求、許可，語氣比may更委婉

need

表示需要，主要用于否定句和疑問句中

shouldn't

should的否定式，表示“不應(yīng)該”

needn't

need的否定式，表示“不必；無需”

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