While________ along the road, Mr. Smith met an old friend of his.
#80925
A
walked
B
he is walking
C
walking
D
is walking
推荐题目
Not until World War II ______ to use new chemical techniques to purify penicillin.
#81196
A
they managed
B
that they managed
C
did they manage
D
they didn’t manage
Some green beans, ______ long enough, can be poisonous (有毒的).
#80298
A
if not be cooked
B
if not cooked
C
if not cooking
D
if not being cooked
Only by increasing the number of doctors by 50 percent ________ properly in this hospital.
#79583
A
can be the patients treated
B
can the patients be treated
C
the patients can be treated
D
treated can be the patients
---How was the weather then? ---Hardly _____ off the plane when it started to rain.
#81637
A
I had stepped
B
had I stepped
C
I stepped
D
did I step
, we would have caught the first bus.
#79909
A
Had we got up earlier
B
If we got up earlier
C
Should we get up earlier
D
Unless we had got up earlier