Since the ground is white, it ____ last night.
A: had snowed
B: must have snowed
C: must be snowing
D: must have been snowing
A: had snowed
B: must have snowed
C: must be snowing
D: must have been snowing
举一反三
- Since the airport is closed this morning, it must ______ last night. A: snow B: have snowed C: have been snowed D: have being snowed
- Since the ground is wet, it ______ last night. A: [A]must have rained B: had rained C: must rain
- Since the ground is wet, it ______ last night. A: must rain B: must have rained C: had rained D: rained
- The flight was delayed for several hours because it _____ heavily last night. A: would snow B: has snowed C: snowed D: has been snowing
- Had it rained last night, the road _____ wet now. A: would be B: must be C: would have been D: must have been