问题

．Our teacher is very busy.He is ________ in working out a teaching plan.

A:involve
B:involving
C:involved
D:to involve

正确答案是：

同类题型

Excuse me, you are _________ of my passingthrough.—I’m sorry, here you go.

Who the match— Class1! They us 3-1.

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—Have you washed your clothes yet?—They________ now.[ ]