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问题: 难题啊

42. ---How can I tell one tree from another?
---You can mostly tell them by the _____ of their leaves.
A. shape B. size C. age D. color
43. ---Do I have to come back tomorrow?
---Yes, you ________.
A. can B. may C. must D. should

解答:

42. A
shape在这里是形状的意思。
这句话的意思是你最能从它们的形状上区分它们。

43。C
must是必须的意思,和原句中的have to相照应。