问题
选择题
Since the road is wet this morning, _____ last night.
A．itmustrain
B．itmusthaverained
C．itmustberained
D．itmusthavebeenrained
答案
答案：B
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Since the road is wet this morning, _____ last night.
A．itmustrain
B．itmusthaverained
C．itmustberained
D．itmusthavebeenrained
答案：B