【C4】______A．calling offB．calling forC．calling uponD．calling up

She__________ her trip to Singapore because she was ill．A.called offB.closed down

The football match was ______because of the heavy rain.A．called offB．called upC．called out

Two of her brothers were______during the Second World War.A．called upB．called onC．called f

Two of her brothers were______during the Second World War.A．called upB．called onC．called f

Who______the workers to take up the struggle？A．called forB．called onC．called inD．called of

55._________A..calling onB..calling forC. calling