In September 2008,China’s key milestone in space travel _____when Zhai Zhigang  conducted the first space walk.
#104025
A
reached
B
was reached
C
has reached
D
had been reached
推荐题目
Hurry up; it is required that we ______ at six. 
#102875
A
will arrive
B
arrived
C
arrive
D
would arrive
—Hey! What's the rush?—The plane ________ at 4∶00 and I need to see my uncle off.
#101263
A
takes off
B
will take off
C
has taken off
D
took off
---Where       you put my dictionary?---I left it on your desk when you     to Tom.
#101371
A
did; spoke
B
have; were speaking
C
had; were speaking
D
had; spoke
—Look! Somebody     the sofa.—Well, it wasn’t me. I didn’t do it.
#101195
A
is cleaning
B
has cleaned
C
was cleaning
D
had cleaned