As a sales person, _____ John lacks his confidence when he is talking with clients.
A. which
B. what
C. why
D. that
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If I _________ his email address, I would have sent him a message yesterday.
A. have know
B. had known
C. will know
D. know
John spent a lot of time ________to his colleagues how challenging the project was.
A. explain
B. explaining
C. to explain
D. explained
It is the high efficiency of the new equipment ___ has increasingly attracted our attention.
A. which
B. what
C. that
D. who
摩擦型带传动是依靠()来传递运动和动力的。
A. 带和带轮接触面之间的正压力
B. 带与带轮之间的摩擦力
C. 带的紧边拉力