80.It was not until 1920 ______ regular radio broadcasts began.
|
A．while |
B．which |
C．that |
D．since |
73.Joan had often heard____ said that Marley had no money.
|
A．it |
B．this |
C．that |
D．one |
68 It was at four o'clock in the afternoon ____ he and his grandpa reached the museum in Guanghan.
|
A．while |
B．that |
C．when |
D．As |
67.I consider____ my duty to help you．
|
A．it |
B．this |
C．that |
D．its |
66. Is＿possible to fly to the moon in a spaceship?
|
A．now |
B．man |
C．that |
D．it |
65.Is＿necessary to tell his father everything?
|
A．it |
B．that |
C．what |
D．He |
