题目内容

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

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_____ 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

Bamboo is used ______ houses in some places .

A. to build
B. to building
C. to be built
D. being built

The day we looked forward to ______ .

A. come
B. coming
C. has come
D. have come

Whom would you rather ______ the work?

A. to have to do
B. to have do
C. have to do
D. have do