Ⅱ 单项选择。
（
D
）1. Karen Marsh looks old, ______?
A. does Karen
B. doesn't Karen
C. does she
D. doesn't she
（
B
）2. — Has she sold her car yet?
— ______.
A. I think not
B. I don't think so
C. I think has
D. I think hasn't
（
A
）3. After a long walk, the little boy ______ be tired.
A. must
B. mustn't
C. can
D. could
（
A
）4. I haven't finished my work yet. I think I need ______ twenty minutes.
A. another
B. other
C. others
D. more
（
D
）5. She ______ be the youngest. She must be the oldest.
A. must
B. mustn't
C. can
D. can't
（
C
）6. — ______ I clean the room now?
— No, you ______.
A. Must, mustn't
B. Can, mustn't
C. Must, needn't
D. Need, can't
