By the time he was twelve, Edison ________ to make a living by himself .
#102887
A
would begin
B
has begun
C
had begun
D
was begun
推荐题目
More than 100 students in that school_________ abroad for further study so far.
#99900
A
are sent
B
were sent
C
had been sent
D
have been sent
It is the first time he ________ here and now it is high time that he ________ around．
#100062
A
come；should be showed
B
has come；was showed
C
has come；be showed
D
came；was showed
You won’t know whether the coat fits you until you ______ it on.
#104094
A
will try
B
have tried
C
tried
D
are trying
I want to change my desk. It _______too much room.
#103672
A
took up
B
has been taken up
C
takes up
D
is taken up
Experiments of this kind ___in both the U．S and Europe well before the Second World War．
#100251
A
had conducted
B
have conducted
C
have been conducted
D
had been conducted