【題目】--_______ I watch TV now?

--Sure, but you ____________ finish your homework first.

A. may; could B. can; must C. can; mustn’t D. may; can’t

【答案】B

【解析】

句意：——-我現(xiàn)在能看電視嗎？ ——當然，但你必須先完成作業(yè)。can能，可能；may可能；must一定，必須；could可能，表示更委婉的說法，mustn't不可以；can't不可能；can和may在表示可能性上，can的語氣比may要強烈，may要顯得婉轉。而且can多用于口語，在正式用于中多用may。can表示可能，多用于否定句與疑問句。根據(jù)I watch TV now，可知這里表示一種請求，這里用can表示能；再根據(jù)but you…finish your homework first，可知這里必須先完成作業(yè)，語氣較為強烈，所以在這里用must表示一定要做的事。故選B。

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