单项选择题

Which of the following sentences is INCORRECT

A. I looked at the flowers, not knowing what to say.
B. I looked at the flowers, and I didn’t know what to say.
C. Looking at the flowers, I didn’t know what to say.
D. Looked at the flowers, I didn’t know what to say.

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单项选择题

Which of the following sentence expresses probability

A. The door can’t have been open. I had locked it myself.
B. You may use my bicycle this weekend,
C. You must be here by ten o’clock.
D. He has stayed in France for 3 years, and now he can speak French well.

单项选择题

Which of the following italicized parts is a time adverbial clause

A. If you don’t fasten your safety belt, your chances of being hurt will be great.
B. She was so absorbed in her job that she didn’t hear anybody knocking at the door.
C. It is doubtful whether a really economic engine could be made.
D. He visited a lot of places while he was travelin