98.
									
										Find out the right option to replace the underlined word/words in the question to make it a correct sentence. 
									
								
																	I am tired as I am working since 7 O'clock in the morning.
															
														
																									
										A:
											I was working
									
																										
										B:
											I have been working
									
																										
										C:
											I had been working 
									
																										
										D:
											I will be working
									
																								 
							
																
									The answer is:
										B