______ quickly, ______ youwon’t be able to catch the first train to the seashore.
A.
To getup, or
B.
Getting up, and
C.
Get up, or
D.
If getting up, but
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【简答题】The reflected light should sweep slowly along the suce of the earth because the mirrors ________. A) would be operated by solar-powered engines B) would orbit thousands of miles high to catch the s...