问题
选择题
It is these poisonous products_____can cause the symptoms of the flu , such as headache and aching muscles .
A.who
B.that
C.how
D.what
答案
答案:B
句意:正是这些有毒物质能够产生流感征兆,如头疼、肌肉疼痛等。该题考查强调句型,强调主语。把it is…that 去掉后,句子仍然完整。