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If that is the case, we may as well try.
如果是那样，我们不妨试一试。
如果是那样，我们不妨试一试。
答案
My brother was very ill, so I had to call the doctor in the middle of the night.
我弟弟病得很厉害，我只得半夜里把医生请来。(客观上需要做这件事。)
我弟弟病得很厉害，我只得半夜里把医生请来。(客观上需要做这件事。)
答案
He said that they must work hard.
他说他们必须努力工作。(主观上要做这件事。)
他说他们必须努力工作。(主观上要做这件事。)
答案
He had to look after his sister yesterday.
他昨天必须得照顾他的妹妹。
他昨天必须得照顾他的妹妹。
答案
He said he must return home before 10:00.
他说他必须10点前回家。
他说他必须10点前回家。
答案
You don’t have to tell him about it.
你没有必要把此事告诉他。
你没有必要把此事告诉他。
答案
You mustn’t tell him about it.
你一定不要把这件事告诉他。
你一定不要把这件事告诉他。
答案
1. —A little bird entered through the open window to join us for dinner yesterday evening.
—Wow, the unexpected guest ________ have been welcomed.
A. will
B. must
C. won’t
D. mustn’t
—Wow, the unexpected guest ________ have been welcomed.
A. will
B. must
C. won’t
D. mustn’t
答案
B
2. —Listen! Is Sarah singing in the neighboring room?
—No. It ________ be Sarah. She has gone to Italy.
A. needn’t
B. may not
C. can’t
D. won’t
—No. It ________ be Sarah. She has gone to Italy.
A. needn’t
B. may not
C. can’t
D. won’t
答案
C
