In the past twelve months the research members ______ the effectiveness of many materials in a home building.
#102889
A
had studied
B
would study
C
studied
D
have studied
推荐题目
See? The strange man I saw yesterday _____ around my house again. Should I call the police？
#100138
A
walk
B
walked
C
is walking
D
has walked
------- Alice, why didn’t you come yesterday? ------- I _______, but I had an unexpected visitor.
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A
had
B
would
C
was going to
D
did
— We thought he would have got the job.— What a pity! He ______too nervous when interviewed.
#99536
A
was
B
had been
C
has been
D
would have been