问题

Professor Smith, together with his assistants, ________on the project day and night to meet the deadline.[ ]

A: work
B: working
C: is working
D: are working

正确答案是：

同类题型

.I made the coat_____my own handsIt was made＿＿＿hand, not with a machine

A child _____ parents are dead is called an orphan.

Having a trip abroad is certainly good for the old couple, but it remains ______ whether they will enjoy it.[ ]

下列各组词类活用相同的一组是（）

He found a purse on the seat and decided to return it to the owner, _______ with the address on the electricity bill.