Only by communicating with each other more frequently ________ clear away the misunderstandings and solve the conflict.
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A great number of students said they were forced to practice the piano .
| A．to question | B．to be questioned | C．questioned | D．question |
—When shall we restart our business ?
—Not until we our plan .
| A．will finish | B．are finishing | C．are to finish | D．have finished |
When changing lanes , a driver should use his turning signal to let other drivers know .
| A．he is entering what lane | B．which lane he is entering |
| C．he is entering which lane | D．which lane is he entering |
you may have , you should gather your courage to face the challenge .
| A．However a serious problem | B．Whatever a serious problem |
| C．However serious a problem | D．No matter how a serious problem |
We last night , but we went to the concert instead .
| A．must have studied | B．should have studied |
| C．could have studied | D．studied |