摘要： There must be no life on the Mars for of air there. A. lack B. lacking C. short D. empty
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There must be no life on the Mars for _____of air there.
[ ]
A. lack
B. lacking
C. short
D. empty
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B. lacking
C. short
D. empty
There must be no life on the Mars for ________of air there.
A. lack B. lacking C. short D. empty
There must be no life on the Mars, for _________ of air there．
[ ]
A．
lack
B．
lacking
C．
short
D．
empty