单项选择题

()tired after the hard work, he fell into bed and went straight to sleep.

A. Felt
B. Feeling
C. Being felt
D. To feel

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单项选择题

If you () careful with electricity, you might get a shock.

A. don't
B. wouldn't
C. won't
D. aren't

单项选择题

The army put up a strong () to the enemy.

A. rebellion
B. attack
C. resistance
D. defense

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