单项选择题

—How often do his parents let him watch TV
—______.

A. In two days
B. When he finishes his homework
C. Only once a week
D. In the evening
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单项选择题
______ such heavy pollution already, it may now be too late to clean up the river.
A. Suffering
B. Suffered
C. To suffer
D. Having suffered
单项选择题
Unfortunately when I arrived she ______, so we only had time for a few words.
A. has just left
B. just left
C. had just left
D. was just leaving
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