单项选择题

The man stops to take his dog outside to do exercise because（）

A.he doesn’t have enough time.
B.he feels tired of running after his dog.
C.he thinks his dog has mental problems.
D.he treats the dog the way his parents treats him.

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单项选择题

That company doesn’t take credit cards，so customers have to pay （）.

A.dollars
B.finance
C.coins
D.cash

单项选择题

Only when the plan failed（）his mistakes.

A.did he realize
B.does he realize
C.he realized
D.he realizes