单项选择题

The students will put off the match until next week, ______ they won’t be so busy.

A. since

B. as

C. when
D. while
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单项选择题
______ for my illness I would have gone to see him.
A. Not being


B. Without being
C. Had it not been


D. Not having been
单项选择题
______ from space, our earth, with water covering 70% of its surface, appears as a blue planet .
A. See

B. Seeing
C. Seen

D. To be seen
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