What’s troubling them is ______ enough experienced workers.
A.that they have to B.they have not
C.their not having D.not their having
C
______ his telephone number,she had some difficulty getting in touch with
Bill.
A.Not knowing B.Knowing not
C.Not having known D.Having not know
A
Bamboo is used ______ houses in some places .
A.to build B.to building C.to be built D.being built
A
Go on ______ the other exercise after you have finished this one.(MET)
A.to do B.doing C.with D.to be doing
A
The day we looked forward to ______ .
A.come B.coming C.has come D.have come
C
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