地球上存在生命物质的主要内部原因是稳定的太阳光照和安全的行星际空间。 [ ]
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—_____ have you been there, Mary?
—Since last winter holiday. [ ]
A. How long
B. How soon
C. When
D. How far
只要业主同意，承包人就可雇用任何分包商而无需监理审查批准。 ( )
ince last winter holiday. [ ]