I ____ to a zoo yesterday. [ ]
A. went
B. go
C. goes
A
I have _________to English Weekly for five years. [ ]
A. subscribed
B. ordered
C. placed an order
D. bought
制冷装置供液电磁阀应装在紧靠()的管路上。
A.膨胀阀前
B.膨胀阀后
C.背压阀前
D.背压阀后