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【单选题】
冻藏中冰衣升华消失快,要每隔( )就得再镀上一次冰衣。A.
１～２个月
B.
2～3个月
C.
３～６个月
D.
６～９个月
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反馈参考答案：
举一反三
【单选题】They missed the last bus and walk home at last. [ ]
A.
had to
B.
must
C.
should
D.
ought to
【单选题】The middle aged woman rushed to the bus station only ______ that the last bus had gone
A.
finding
B.
to find
C.
found
D.
finds
【单选题】It was a very cold night and we stood______at the bus stop, waiting for the last bus.
A.
shivering
B.
trembling
C.
shaking
D.
vibrating
【单选题】He hurried to the bus stop, ______ the last bus had already left.
A.
only finding
B.
only having found
C.
only to find
D.
only to have found
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