题目内容
Look at your face. It's dirty. You ______ wash your face.
[ ]
|
A ．must |
B ．have to |
|
C ．mustn't |
D ．don't have to |
答案：B
解析：
解析：
|
脸脏是客观上的外部原因，因为脸很脏所以非得要洗，所以用 have to，故B。 |
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