摘要：20． the temperature might drop, coal was prepared for warming． A．To consider B．Considered C．Considering D．To be considered
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________ the temperature might drop, coal was prepared for warming．
[ ]
A．
To consider
B．
Considered
C．
Considering
D．
To be considered
________ the temperature might drop, coal was prepared for warming．
[ ]
A．To consider
B．Considered
C．Considering
D．To be considered
________ the temperature might drop, coal was prepared for warming．
[ ]
A．To consider
B．Considered
C．Considering
D．To be considered